Remove the rest of #pragma once in one big CL.

For context see this thread:
  https://groups.google.com/a/chromium.org/forum/?fromgroups#!topic/chromium-dev/RMcVNGjB4II

TBR=thakis,pkasting,jam

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146163 0039d316-1c4b-4281-b951-d872f2087c98

153 files changed, 0 insertions, 153 deletions

diff --git a/ui/base/accelerators/accelerator.h b/ui/base/accelerators/accelerator.h
index 6c7753f..2f6e169 100644
--- a/ui/base/accelerators/accelerator.h
+++ b/ui/base/accelerators/accelerator.h
@@ -10,7 +10,6 @@
 
 #ifndef UI_BASE_ACCELERATORS_ACCELERATOR_H_
 #define UI_BASE_ACCELERATORS_ACCELERATOR_H_
-#pragma once
 
 #include "base/string16.h"
 #include "ui/base/keycodes/keyboard_codes.h"
diff --git a/ui/base/accelerators/accelerator_cocoa.h b/ui/base/accelerators/accelerator_cocoa.h
index 5be4715..4c0736e 100644
--- a/ui/base/accelerators/accelerator_cocoa.h
+++ b/ui/base/accelerators/accelerator_cocoa.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ACCELERATORS_ACCELERATOR_COCOA_H_
 #define UI_BASE_ACCELERATORS_ACCELERATOR_COCOA_H_
-#pragma once
 
 #include <Foundation/Foundation.h>
 
diff --git a/ui/base/accelerators/accelerator_gtk.h b/ui/base/accelerators/accelerator_gtk.h
index 8ec6fd6..3673d24 100644
--- a/ui/base/accelerators/accelerator_gtk.h
+++ b/ui/base/accelerators/accelerator_gtk.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ACCELERATORS_ACCELERATOR_GTK_H_
 #define UI_BASE_ACCELERATORS_ACCELERATOR_GTK_H_
-#pragma once
 
 #include <gdk/gdk.h>
 
diff --git a/ui/base/accelerators/accelerator_manager.h b/ui/base/accelerators/accelerator_manager.h
index 0b50ed4..3310db7 100644
--- a/ui/base/accelerators/accelerator_manager.h
+++ b/ui/base/accelerators/accelerator_manager.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ACCELERATORS_ACCELERATOR_MANAGER_H_
 #define UI_BASE_ACCELERATORS_ACCELERATOR_MANAGER_H_
-#pragma once
 
 #include <list>
 #include <map>
diff --git a/ui/base/accessibility/accessibility_types.h b/ui/base/accessibility/accessibility_types.h
index b50aed1..91e4974 100644
--- a/ui/base/accessibility/accessibility_types.h
+++ b/ui/base/accessibility/accessibility_types.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ACCESSIBILITY_ACCESSIBILITY_TYPES_H_
 #define UI_BASE_ACCESSIBILITY_ACCESSIBILITY_TYPES_H_
-#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/ui/base/accessibility/accessible_text_utils.h b/ui/base/accessibility/accessible_text_utils.h
index 0cf6888..fb9ab7c 100644
--- a/ui/base/accessibility/accessible_text_utils.h
+++ b/ui/base/accessibility/accessible_text_utils.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ACCESSIBILITY_ACCESSIBLE_TEXT_UTILS_H_
 #define UI_BASE_ACCESSIBILITY_ACCESSIBLE_TEXT_UTILS_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/accessibility/accessible_view_state.h b/ui/base/accessibility/accessible_view_state.h
index 2feeec3..c132fcd 100644
--- a/ui/base/accessibility/accessible_view_state.h
+++ b/ui/base/accessibility/accessible_view_state.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ACCESSIBILITY_ACCESSIBLE_VIEW_STATE_H_
 #define UI_BASE_ACCESSIBILITY_ACCESSIBLE_VIEW_STATE_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
diff --git a/ui/base/animation/animation.h b/ui/base/animation/animation.h
index 257e99b..0183b7f 100644
--- a/ui/base/animation/animation.h
+++ b/ui/base/animation/animation.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_ANIMATION_H_
 #define UI_BASE_ANIMATION_ANIMATION_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
diff --git a/ui/base/animation/animation_container.h b/ui/base/animation/animation_container.h
index bf4db5d..89f6392 100644
--- a/ui/base/animation/animation_container.h
+++ b/ui/base/animation/animation_container.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_ANIMATION_CONTAINER_H_
 #define UI_BASE_ANIMATION_ANIMATION_CONTAINER_H_
-#pragma once
 
 #include <set>
 
diff --git a/ui/base/animation/animation_container_element.h b/ui/base/animation/animation_container_element.h
index 169347f35..8c082e6 100644
--- a/ui/base/animation/animation_container_element.h
+++ b/ui/base/animation/animation_container_element.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
 #define UI_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
-#pragma once
 
 #include "base/time.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/animation/animation_container_observer.h b/ui/base/animation/animation_container_observer.h
index 5df7650..06948ef 100644
--- a/ui/base/animation/animation_container_observer.h
+++ b/ui/base/animation/animation_container_observer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
 #define UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/animation/animation_delegate.h b/ui/base/animation/animation_delegate.h
index 43e5062..9a7edbc 100644
--- a/ui/base/animation/animation_delegate.h
+++ b/ui/base/animation/animation_delegate.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_ANIMATION_DELEGATE_H_
 #define UI_BASE_ANIMATION_ANIMATION_DELEGATE_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/animation/linear_animation.h b/ui/base/animation/linear_animation.h
index 7baf476..9f385d6 100644
--- a/ui/base/animation/linear_animation.h
+++ b/ui/base/animation/linear_animation.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_LINEAR_ANIMATION_H_
 #define UI_BASE_ANIMATION_LINEAR_ANIMATION_H_
-#pragma once
 
 #include "base/time.h"
 #include "ui/base/animation/animation.h"
diff --git a/ui/base/animation/multi_animation.h b/ui/base/animation/multi_animation.h
index 240c6da6..37f04b0 100644
--- a/ui/base/animation/multi_animation.h
+++ b/ui/base/animation/multi_animation.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_MULTI_ANIMATION_H_
 #define UI_BASE_ANIMATION_MULTI_ANIMATION_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/animation/slide_animation.h b/ui/base/animation/slide_animation.h
index 4d90e1d..a5eed76 100644
--- a/ui/base/animation/slide_animation.h
+++ b/ui/base/animation/slide_animation.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_SLIDE_ANIMATION_H_
 #define UI_BASE_ANIMATION_SLIDE_ANIMATION_H_
-#pragma once
 
 #include "ui/base/animation/linear_animation.h"
 #include "ui/base/animation/tween.h"
diff --git a/ui/base/animation/test_animation_delegate.h b/ui/base/animation/test_animation_delegate.h
index e6c4047..0036c37 100644
--- a/ui/base/animation/test_animation_delegate.h
+++ b/ui/base/animation/test_animation_delegate.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_TEST_ANIMATION_DELEGATE_H_
 #define UI_BASE_ANIMATION_TEST_ANIMATION_DELEGATE_H_
-#pragma once
 
 #include "base/message_loop.h"
 #include "ui/base/animation/animation_delegate.h"
diff --git a/ui/base/animation/throb_animation.h b/ui/base/animation/throb_animation.h
index 08b2840..4292eee 100644
--- a/ui/base/animation/throb_animation.h
+++ b/ui/base/animation/throb_animation.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_THROB_ANIMATION_H_
 #define UI_BASE_ANIMATION_THROB_ANIMATION_H_
-#pragma once
 
 #include "ui/base/animation/slide_animation.h"
 
diff --git a/ui/base/animation/tween.h b/ui/base/animation/tween.h
index 829fa7d..ca10a0a 100644
--- a/ui/base/animation/tween.h
+++ b/ui/base/animation/tween.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_ANIMATION_TWEEN_H_
 #define UI_BASE_ANIMATION_TWEEN_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/clipboard/clipboard.h b/ui/base/clipboard/clipboard.h
index ab5701a..b98cfc4 100644
--- a/ui/base/clipboard/clipboard.h
+++ b/ui/base/clipboard/clipboard.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_CLIPBOARD_CLIPBOARD_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_H_
-#pragma once
 
 #include <map>
 #include <string>
diff --git a/ui/base/clipboard/clipboard_util_win.h b/ui/base/clipboard/clipboard_util_win.h
index 87e503a..24cf540 100644
--- a/ui/base/clipboard/clipboard_util_win.h
+++ b/ui/base/clipboard/clipboard_util_win.h
@@ -6,7 +6,6 @@
 
 #ifndef UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
-#pragma once
 
 #include <shlobj.h>
 #include <map>
diff --git a/ui/base/clipboard/custom_data_helper.h b/ui/base/clipboard/custom_data_helper.h
index c01dbdf..ab7aae9 100644
--- a/ui/base/clipboard/custom_data_helper.h
+++ b/ui/base/clipboard/custom_data_helper.h
@@ -9,7 +9,6 @@
 
 #ifndef UI_BASE_CLIPBOARD_CUSTOM_DATA_HELPER_H_
 #define UI_BASE_CLIPBOARD_CUSTOM_DATA_HELPER_H_
-#pragma once
 
 #include <map>
 #include <vector>
diff --git a/ui/base/clipboard/scoped_clipboard_writer.h b/ui/base/clipboard/scoped_clipboard_writer.h
index d4f154b..d2f5b31 100644
--- a/ui/base/clipboard/scoped_clipboard_writer.h
+++ b/ui/base/clipboard/scoped_clipboard_writer.h
@@ -10,7 +10,6 @@
 
 #ifndef UI_BASE_CLIPBOARD_SCOPED_CLIPBOARD_WRITER_H_
 #define UI_BASE_CLIPBOARD_SCOPED_CLIPBOARD_WRITER_H_
-#pragma once
 
 #include <string>
 
diff --git a/ui/base/cocoa/base_view.h b/ui/base/cocoa/base_view.h
index e1b4ff1..136b125 100644
--- a/ui/base/cocoa/base_view.h
+++ b/ui/base/cocoa/base_view.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_COCOA_BASE_VIEW_H_
 #define UI_BASE_COCOA_BASE_VIEW_H_
-#pragma once
 
 #import <Cocoa/Cocoa.h>
 
diff --git a/ui/base/cocoa/find_pasteboard.h b/ui/base/cocoa/find_pasteboard.h
index 870e7ec..ec8f309 100644
--- a/ui/base/cocoa/find_pasteboard.h
+++ b/ui/base/cocoa/find_pasteboard.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_COCOA_FIND_PASTEBOARD_H_
 #define UI_BASE_COCOA_FIND_PASTEBOARD_H_
-#pragma once
 
 #include "base/string16.h"
 
diff --git a/ui/base/cocoa/fullscreen_window_manager.h b/ui/base/cocoa/fullscreen_window_manager.h
index 6564ce9..b09493b 100644
--- a/ui/base/cocoa/fullscreen_window_manager.h
+++ b/ui/base/cocoa/fullscreen_window_manager.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_COCOA_FULLSCREEN_WINDOW_MANAGER_H_
 #define UI_BASE_COCOA_FULLSCREEN_WINDOW_MANAGER_H_
-#pragma once
 
 #import <Cocoa/Cocoa.h>
 
diff --git a/ui/base/cocoa/nib_loading.h b/ui/base/cocoa/nib_loading.h
index 653aba4..ab8e23f 100644
--- a/ui/base/cocoa/nib_loading.h
+++ b/ui/base/cocoa/nib_loading.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_COCOA_NIB_LOADING_H_
 #define UI_BASE_COCOA_NIB_LOADING_H_
-#pragma once
 
 #import <Cocoa/Cocoa.h>
 
diff --git a/ui/base/cocoa/underlay_opengl_hosting_window.h b/ui/base/cocoa/underlay_opengl_hosting_window.h
index d312362..2c5b92a 100644
--- a/ui/base/cocoa/underlay_opengl_hosting_window.h
+++ b/ui/base/cocoa/underlay_opengl_hosting_window.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_COCOA_UNDERLAY_OPENGL_HOSTING_WINDOW_H_
 #define UI_BASE_COCOA_UNDERLAY_OPENGL_HOSTING_WINDOW_H_
-#pragma once
 
 #import <Cocoa/Cocoa.h>
 
diff --git a/ui/base/cocoa/window_size_constants.h b/ui/base/cocoa/window_size_constants.h
index 9f33336..11cf318 100644
--- a/ui/base/cocoa/window_size_constants.h
+++ b/ui/base/cocoa/window_size_constants.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_COCOA_WINDOW_SIZE_CONSTANTS_H_
 #define UI_BASE_COCOA_WINDOW_SIZE_CONSTANTS_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/cursor/cursor.h b/ui/base/cursor/cursor.h
index 09076e9..56529e9 100644
--- a/ui/base/cursor/cursor.h
+++ b/ui/base/cursor/cursor.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_CURSOR_CURSOR_H_
 #define UI_BASE_CURSOR_CURSOR_H_
-#pragma once
 
 #include "build/build_config.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/dialogs/base_shell_dialog.h b/ui/base/dialogs/base_shell_dialog.h
index de15a32..a4b954f 100644
--- a/ui/base/dialogs/base_shell_dialog.h
+++ b/ui/base/dialogs/base_shell_dialog.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DIALOGS_BASE_SHELL_DIALOG_H_
 #define UI_BASE_DIALOGS_BASE_SHELL_DIALOG_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 #include "ui/gfx/native_widget_types.h"
diff --git a/ui/base/dialogs/select_file_policy.h b/ui/base/dialogs/select_file_policy.h
index 36fe427..63e8781 100644
--- a/ui/base/dialogs/select_file_policy.h
+++ b/ui/base/dialogs/select_file_policy.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DIALOGS_SELECT_FILE_POLICY_H_
 #define UI_BASE_DIALOGS_SELECT_FILE_POLICY_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/dialogs/selected_file_info.h b/ui/base/dialogs/selected_file_info.h
index 88029ba..005de6f 100644
--- a/ui/base/dialogs/selected_file_info.h
+++ b/ui/base/dialogs/selected_file_info.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DIALOGS_SELECTED_FILE_INFO_H_
 #define UI_BASE_DIALOGS_SELECTED_FILE_INFO_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/dragdrop/cocoa_dnd_util.h b/ui/base/dragdrop/cocoa_dnd_util.h
index 5f3bd3b..66ed1a2 100644
--- a/ui/base/dragdrop/cocoa_dnd_util.h
+++ b/ui/base/dragdrop/cocoa_dnd_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_MAC_DND_UTIL_H_
 #define UI_BASE_DRAGDROP_MAC_DND_UTIL_H_
-#pragma once
 
 #import <Cocoa/Cocoa.h>
 
diff --git a/ui/base/dragdrop/download_file_interface.h b/ui/base/dragdrop/download_file_interface.h
index 5b98510..3d90444 100644
--- a/ui/base/dragdrop/download_file_interface.h
+++ b/ui/base/dragdrop/download_file_interface.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_DOWNLOAD_FILE_INTERFACE_H_
 #define UI_BASE_DRAGDROP_DOWNLOAD_FILE_INTERFACE_H_
-#pragma once
 
 #include "build/build_config.h"
 
diff --git a/ui/base/dragdrop/drag_drop_types.h b/ui/base/dragdrop/drag_drop_types.h
index e042332..26befc5 100644
--- a/ui/base/dragdrop/drag_drop_types.h
+++ b/ui/base/dragdrop/drag_drop_types.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_DRAG_DROP_TYPES_H_
 #define UI_BASE_DRAGDROP_DRAG_DROP_TYPES_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/dragdrop/drag_source.h b/ui/base/dragdrop/drag_source.h
index 777a8ee..37969fe 100644
--- a/ui/base/dragdrop/drag_source.h
+++ b/ui/base/dragdrop/drag_source.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_DRAG_SOURCE_H_
 #define UI_BASE_DRAGDROP_DRAG_SOURCE_H_
-#pragma once
 
 #include <objidl.h>
 
diff --git a/ui/base/dragdrop/drag_utils.h b/ui/base/dragdrop/drag_utils.h
index 7c8e443..c2bf02c 100644
--- a/ui/base/dragdrop/drag_utils.h
+++ b/ui/base/dragdrop/drag_utils.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_DRAG_UTILS_H_
 #define UI_BASE_DRAGDROP_DRAG_UTILS_H_
-#pragma once
 
 #include <string>
 
diff --git a/ui/base/dragdrop/drop_target.h b/ui/base/dragdrop/drop_target.h
index 8099a61..ffab014 100644
--- a/ui/base/dragdrop/drop_target.h
+++ b/ui/base/dragdrop/drop_target.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_DROP_TARGET_H_
 #define UI_BASE_DRAGDROP_DROP_TARGET_H_
-#pragma once
 
 #include <objidl.h>
 
diff --git a/ui/base/dragdrop/gtk_dnd_util.h b/ui/base/dragdrop/gtk_dnd_util.h
index 0f0d29a..b9ac52c 100644
--- a/ui/base/dragdrop/gtk_dnd_util.h
+++ b/ui/base/dragdrop/gtk_dnd_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_GTK_DND_UTIL_H_
 #define UI_BASE_DRAGDROP_GTK_DND_UTIL_H_
-#pragma once
 
 #include <gtk/gtk.h>
 
diff --git a/ui/base/dragdrop/os_exchange_data.h b/ui/base/dragdrop/os_exchange_data.h
index 702a8ab..92b6798 100644
--- a/ui/base/dragdrop/os_exchange_data.h
+++ b/ui/base/dragdrop/os_exchange_data.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_H_
-#pragma once
 
 #include "build/build_config.h"
 
diff --git a/ui/base/dragdrop/os_exchange_data_provider_aura.h b/ui/base/dragdrop/os_exchange_data_provider_aura.h
index 6137062..505e2c1 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_aura.h
+++ b/ui/base/dragdrop/os_exchange_data_provider_aura.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURA_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURA_H_
-#pragma once
 
 #include <map>
 
diff --git a/ui/base/dragdrop/os_exchange_data_provider_gtk.h b/ui/base/dragdrop/os_exchange_data_provider_gtk.h
index e43afbe..98cb739 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_gtk.h
+++ b/ui/base/dragdrop/os_exchange_data_provider_gtk.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_GTK_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_GTK_H_
-#pragma once
 
 #include <gtk/gtk.h>
 #include <map>
diff --git a/ui/base/dragdrop/os_exchange_data_provider_win.h b/ui/base/dragdrop/os_exchange_data_provider_win.h
index 40ef08f..576445f 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_win.h
+++ b/ui/base/dragdrop/os_exchange_data_provider_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
-#pragma once
 
 #include <objidl.h>
 #include <shlobj.h>
diff --git a/ui/base/events.h b/ui/base/events.h
index 6f7ed0d..1a1c8f3 100644
--- a/ui/base/events.h
+++ b/ui/base/events.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_EVENTS_H_
 #define UI_BASE_EVENTS_H_
-#pragma once
 
 #include "base/event_types.h"
 #include "ui/base/keycodes/keyboard_codes.h"
diff --git a/ui/base/gestures/gesture_configuration.h b/ui/base/gestures/gesture_configuration.h
index b439ef3..206ce91 100644
--- a/ui/base/gestures/gesture_configuration.h
+++ b/ui/base/gestures/gesture_configuration.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_GESTURE_CONFIGURATION_H_
 #define UI_BASE_GESTURES_GESTURE_CONFIGURATION_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/gestures/gesture_point.h b/ui/base/gestures/gesture_point.h
index d019892..2ddf50c 100644
--- a/ui/base/gestures/gesture_point.h
+++ b/ui/base/gestures/gesture_point.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_GESTURE_POINT_H_
 #define UI_BASE_GESTURES_GESTURE_POINT_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/gestures/velocity_calculator.h"
diff --git a/ui/base/gestures/gesture_recognizer.h b/ui/base/gestures/gesture_recognizer.h
index a820824..d8a7663 100644
--- a/ui/base/gestures/gesture_recognizer.h
+++ b/ui/base/gestures/gesture_recognizer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_GESTURE_RECOGNIZER_H_
 #define UI_BASE_GESTURES_GESTURE_RECOGNIZER_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/gestures/gesture_recognizer_impl.h b/ui/base/gestures/gesture_recognizer_impl.h
index fbd82d4..8b43001 100644
--- a/ui/base/gestures/gesture_recognizer_impl.h
+++ b/ui/base/gestures/gesture_recognizer_impl.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
 #define UI_BASE_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
-#pragma once
 
 #include <map>
 #include <queue>
diff --git a/ui/base/gestures/gesture_sequence.h b/ui/base/gestures/gesture_sequence.h
index 812e63e..a8be2a6 100644
--- a/ui/base/gestures/gesture_sequence.h
+++ b/ui/base/gestures/gesture_sequence.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_GESTURE_SEQUENCE_H_
 #define UI_BASE_GESTURES_GESTURE_SEQUENCE_H_
-#pragma once
 
 #include "base/timer.h"
 #include "ui/base/events.h"
diff --git a/ui/base/gestures/gesture_types.h b/ui/base/gestures/gesture_types.h
index a55914c..09c80b0 100644
--- a/ui/base/gestures/gesture_types.h
+++ b/ui/base/gestures/gesture_types.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_GESTURE_TYPES_H_
 #define UI_BASE_GESTURES_GESTURE_TYPES_H_
-#pragma once
 
 #include "base/logging.h"
 #include "base/time.h"
diff --git a/ui/base/gestures/gesture_util.h b/ui/base/gestures/gesture_util.h
index 9b49e85..4e618a9 100644
--- a/ui/base/gestures/gesture_util.h
+++ b/ui/base/gestures/gesture_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_GESTURE_UTIL_H_
 #define UI_BASE_GESTURES_GESTURE_UTIL_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/gestures/velocity_calculator.h b/ui/base/gestures/velocity_calculator.h
index 1029af3..a6d7919 100644
--- a/ui/base/gestures/velocity_calculator.h
+++ b/ui/base/gestures/velocity_calculator.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GESTURES_VELOCITY_CALCULATOR_H_
 #define UI_BASE_GESTURES_VELOCITY_CALCULATOR_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/glib/glib_integers.h b/ui/base/glib/glib_integers.h
index 4317c27..a875ffe 100644
--- a/ui/base/glib/glib_integers.h
+++ b/ui/base/glib/glib_integers.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GLIB_GLIB_INTEGERS_H_
 #define UI_BASE_GLIB_GLIB_INTEGERS_H_
-#pragma once
 
 // GLib/GObject/Gtk all use their own integer typedefs. They are copied here
 // for forward declaration reasons so we don't pull in all of glib/gtypes.h
diff --git a/ui/base/glib/glib_signal.h b/ui/base/glib/glib_signal.h
index b99a69e..23630f4 100644
--- a/ui/base/glib/glib_signal.h
+++ b/ui/base/glib/glib_signal.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GLIB_GLIB_SIGNAL_H_
 #define UI_BASE_GLIB_GLIB_SIGNAL_H_
-#pragma once
 
 typedef void* gpointer;
 
diff --git a/ui/base/gtk/event_synthesis_gtk.h b/ui/base/gtk/event_synthesis_gtk.h
index f7d16d6..50dde0f 100644
--- a/ui/base/gtk/event_synthesis_gtk.h
+++ b/ui/base/gtk/event_synthesis_gtk.h
@@ -8,7 +8,6 @@
 
 #ifndef UI_BASE_GTK_EVENT_SYNTHESIS_GTK_
 #define UI_BASE_GTK_EVENT_SYNTHESIS_GTK_
-#pragma once
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
diff --git a/ui/base/gtk/focus_store_gtk.h b/ui/base/gtk/focus_store_gtk.h
index e237ee1..b0f420d 100644
--- a/ui/base/gtk/focus_store_gtk.h
+++ b/ui/base/gtk/focus_store_gtk.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_FOCUS_STORE_GTK_H_
 #define UI_BASE_GTK_FOCUS_STORE_GTK_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/gtk/g_object_destructor_filo.h b/ui/base/gtk/g_object_destructor_filo.h
index d44bd7f..a01f7e3 100644
--- a/ui/base/gtk/g_object_destructor_filo.h
+++ b/ui/base/gtk/g_object_destructor_filo.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_G_OBJECT_DESTRUCTOR_FILO_H_
 #define UI_BASE_GTK_G_OBJECT_DESTRUCTOR_FILO_H_
-#pragma once
 
 #include <glib.h>
 #include <map>
diff --git a/ui/base/gtk/gdk_x_compat.h b/ui/base/gtk/gdk_x_compat.h
index d304bb9..b53aefc0 100644
--- a/ui/base/gtk/gdk_x_compat.h
+++ b/ui/base/gtk/gdk_x_compat.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_GDK_X_COMPAT_H_
 #define UI_BASE_GTK_GDK_X_COMPAT_H_
-#pragma once
 
 #include <gdk/gdkx.h>
 
diff --git a/ui/base/gtk/gtk_compat.h b/ui/base/gtk/gtk_compat.h
index b0c59e1..0518fad 100644
--- a/ui/base/gtk/gtk_compat.h
+++ b/ui/base/gtk/gtk_compat.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_GTK_COMPAT_H_
 #define UI_BASE_GTK_GTK_COMPAT_H_
-#pragma once
 
 #include <gtk/gtk.h>
 
diff --git a/ui/base/gtk/gtk_expanded_container.h b/ui/base/gtk/gtk_expanded_container.h
index 23f1d69..63e3dbd 100644
--- a/ui/base/gtk/gtk_expanded_container.h
+++ b/ui/base/gtk/gtk_expanded_container.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_GTK_EXPANDED_CONTAINER_H_
 #define UI_BASE_GTK_GTK_EXPANDED_CONTAINER_H_
-#pragma once
 
 #include <gdk/gdk.h>
 #include <gtk/gtk.h>
diff --git a/ui/base/gtk/gtk_floating_container.h b/ui/base/gtk/gtk_floating_container.h
index a6977df..2d68edd 100644
--- a/ui/base/gtk/gtk_floating_container.h
+++ b/ui/base/gtk/gtk_floating_container.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_GTK_FLOATING_CONTAINER_H_
 #define UI_BASE_GTK_GTK_FLOATING_CONTAINER_H_
-#pragma once
 
 #include <gdk/gdk.h>
 #include <gtk/gtk.h>
diff --git a/ui/base/gtk/gtk_hig_constants.h b/ui/base/gtk/gtk_hig_constants.h
index a2827fe..147c5189 100644
--- a/ui/base/gtk/gtk_hig_constants.h
+++ b/ui/base/gtk/gtk_hig_constants.h
@@ -9,7 +9,6 @@
 
 #ifndef UI_BASE_GTK_GTK_HIG_CONSTANTS_H_
 #define UI_BASE_GTK_GTK_HIG_CONSTANTS_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/gtk/gtk_im_context_util.h b/ui/base/gtk/gtk_im_context_util.h
index ae7f2a1..456d6ca 100644
--- a/ui/base/gtk/gtk_im_context_util.h
+++ b/ui/base/gtk/gtk_im_context_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_GTK_IM_CONTEXT_UTIL_H_
 #define UI_BASE_GTK_GTK_IM_CONTEXT_UTIL_H_
-#pragma once
 
 #include <pango/pango-attributes.h>
 
diff --git a/ui/base/gtk/gtk_signal.h b/ui/base/gtk/gtk_signal.h
index 68c96bf..ca6fa23 100644
--- a/ui/base/gtk/gtk_signal.h
+++ b/ui/base/gtk/gtk_signal.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_GTK_SIGNAL_H_
 #define UI_BASE_GTK_GTK_SIGNAL_H_
-#pragma once
 
 #include "ui/base/glib/glib_signal.h"
 
diff --git a/ui/base/gtk/gtk_signal_registrar.h b/ui/base/gtk/gtk_signal_registrar.h
index 630ba31..a7dd157 100644
--- a/ui/base/gtk/gtk_signal_registrar.h
+++ b/ui/base/gtk/gtk_signal_registrar.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_GTK_SIGNAL_REGISTRAR_H_
 #define UI_BASE_GTK_GTK_SIGNAL_REGISTRAR_H_
-#pragma once
 
 #include <glib.h>
 #include <map>
diff --git a/ui/base/gtk/menu_label_accelerator_util.h b/ui/base/gtk/menu_label_accelerator_util.h
index 276a859..dced69f 100644
--- a/ui/base/gtk/menu_label_accelerator_util.h
+++ b/ui/base/gtk/menu_label_accelerator_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_MENU_LABEL_ACCELERATOR_UTIL_H_
 #define UI_BASE_GTK_MENU_LABEL_ACCELERATOR_UTIL_H_
-#pragma once
 
 #include <string>
 
diff --git a/ui/base/gtk/owned_widget_gtk.h b/ui/base/gtk/owned_widget_gtk.h
index 73e5f31..ba3068c 100644
--- a/ui/base/gtk/owned_widget_gtk.h
+++ b/ui/base/gtk/owned_widget_gtk.h
@@ -48,7 +48,6 @@
 
 #ifndef UI_BASE_GTK_OWNED_WIDGET_GTK_H_
 #define UI_BASE_GTK_OWNED_WIDGET_GTK_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/gtk/scoped_gobject.h b/ui/base/gtk/scoped_gobject.h
index 5564851..2e62e8f 100644
--- a/ui/base/gtk/scoped_gobject.h
+++ b/ui/base/gtk/scoped_gobject.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_SCOPED_GOBJECT_H_
 #define UI_BASE_GTK_SCOPED_GOBJECT_H_
-#pragma once
 
 #include <glib-object.h>
 
diff --git a/ui/base/gtk/scoped_region.h b/ui/base/gtk/scoped_region.h
index 239e958..faa7e81 100644
--- a/ui/base/gtk/scoped_region.h
+++ b/ui/base/gtk/scoped_region.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_GTK_SCOPED_REGION_H_
 #define UI_BASE_GTK_SCOPED_REGION_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/hit_test.h b/ui/base/hit_test.h
index 8a464e9..9fb46a4 100644
--- a/ui/base/hit_test.h
+++ b/ui/base/hit_test.h
@@ -4,7 +4,6 @@
 
 #ifndef VIEWS_WINDOW_HIT_TEST_H_
 #define VIEWS_WINDOW_HIT_TEST_H_
-#pragma once
 
 #if !defined(OS_WIN)
 
diff --git a/ui/base/ime/character_composer.h b/ui/base/ime/character_composer.h
index 6b18002..2a93ee3 100644
--- a/ui/base/ime/character_composer.h
+++ b/ui/base/ime/character_composer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_CHARACTER_COMPOSER_H_
 #define UI_BASE_IME_CHARACTER_COMPOSER_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/ime/composition_text.h b/ui/base/ime/composition_text.h
index 8d76495..085141e 100644
--- a/ui/base/ime/composition_text.h
+++ b/ui/base/ime/composition_text.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_COMPOSITION_TEXT_H_
 #define UI_BASE_IME_COMPOSITION_TEXT_H_
-#pragma once
 
 #include "base/string16.h"
 #include "ui/base/ime/composition_underline.h"
diff --git a/ui/base/ime/composition_underline.h b/ui/base/ime/composition_underline.h
index 448789c..ecf9d9d 100644
--- a/ui/base/ime/composition_underline.h
+++ b/ui/base/ime/composition_underline.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_COMPOSITION_UNDERLINE_H_
 #define UI_BASE_IME_COMPOSITION_UNDERLINE_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/ime/ibus_client.h b/ui/base/ime/ibus_client.h
index 7a53d44..04a6273 100644
--- a/ui/base/ime/ibus_client.h
+++ b/ui/base/ime/ibus_client.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_IBUS_CLIENT_H_
 #define UI_BASE_IME_IBUS_CLIENT_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/ime/input_method.h b/ui/base/ime/input_method.h
index b89f5fe..d06b0be 100644
--- a/ui/base/ime/input_method.h
+++ b/ui/base/ime/input_method.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_INPUT_METHOD_H_
 #define UI_BASE_IME_INPUT_METHOD_H_
-#pragma once
 
 #include <string>
 
diff --git a/ui/base/ime/input_method_base.h b/ui/base/ime/input_method_base.h
index f961c05..61511d0 100644
--- a/ui/base/ime/input_method_base.h
+++ b/ui/base/ime/input_method_base.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_INPUT_METHOD_BASE_H_
 #define UI_BASE_IME_INPUT_METHOD_BASE_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
diff --git a/ui/base/ime/input_method_delegate.h b/ui/base/ime/input_method_delegate.h
index 9a84730..c398e27 100644
--- a/ui/base/ime/input_method_delegate.h
+++ b/ui/base/ime/input_method_delegate.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_INPUT_METHOD_DELEGATE_H_
 #define UI_BASE_IME_INPUT_METHOD_DELEGATE_H_
-#pragma once
 
 #include "base/event_types.h"
 #include "ui/base/events.h"
diff --git a/ui/base/ime/input_method_factory.h b/ui/base/ime/input_method_factory.h
index 353f5b1..9bb81bc 100644
--- a/ui/base/ime/input_method_factory.h
+++ b/ui/base/ime/input_method_factory.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_INPUT_METHOD_FACTORY_H_
 #define UI_BASE_IME_INPUT_METHOD_FACTORY_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/ime/input_method_ibus.h b/ui/base/ime/input_method_ibus.h
index 7ea92fb..d6adc38 100644
--- a/ui/base/ime/input_method_ibus.h
+++ b/ui/base/ime/input_method_ibus.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_INPUT_METHOD_IBUS_H_
 #define UI_BASE_IME_INPUT_METHOD_IBUS_H_
-#pragma once
 
 #include <set>
 #include <string>
diff --git a/ui/base/ime/mock_input_method.h b/ui/base/ime/mock_input_method.h
index 5750441..bafd868 100644
--- a/ui/base/ime/mock_input_method.h
+++ b/ui/base/ime/mock_input_method.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_MOCK_INPUT_METHOD_H_
 #define UI_BASE_IME_MOCK_INPUT_METHOD_H_
-#pragma once
 
 #include <string>
 
diff --git a/ui/base/ime/text_input_client.h b/ui/base/ime/text_input_client.h
index 3736e63..1ecc190 100644
--- a/ui/base/ime/text_input_client.h
+++ b/ui/base/ime/text_input_client.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_TEXT_INPUT_CLIENT_H_
 #define UI_BASE_IME_TEXT_INPUT_CLIENT_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/i18n/rtl.h"
diff --git a/ui/base/ime/text_input_type.h b/ui/base/ime/text_input_type.h
index 4f590f4..844bffa 100644
--- a/ui/base/ime/text_input_type.h
+++ b/ui/base/ime/text_input_type.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_IME_TEXT_INPUT_TYPE_H_
 #define UI_BASE_IME_TEXT_INPUT_TYPE_H_
-#pragma once
 
 namespace ui {
 
diff --git a/ui/base/keycodes/keyboard_code_conversion_gtk.h b/ui/base/keycodes/keyboard_code_conversion_gtk.h
index 7a4e167..77e1ef8 100644
--- a/ui/base/keycodes/keyboard_code_conversion_gtk.h
+++ b/ui/base/keycodes/keyboard_code_conversion_gtk.h
@@ -35,7 +35,6 @@
 
 #ifndef UI_BASE_KEYCODES_KEYBOARD_CODE_CONVERSION_GTK_H_
 #define UI_BASE_KEYCODES_KEYBOARD_CODE_CONVERSION_GTK_H_
-#pragma once
 
 #include "ui/base/keycodes/keyboard_codes_posix.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/keycodes/keyboard_code_conversion_win.h b/ui/base/keycodes/keyboard_code_conversion_win.h
index bf9af37..1cf91de 100644
--- a/ui/base/keycodes/keyboard_code_conversion_win.h
+++ b/ui/base/keycodes/keyboard_code_conversion_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_KEYCODES_KEYBOARD_CODE_CONVERSION_WIN_H_
 #define UI_BASE_KEYCODES_KEYBOARD_CODE_CONVERSION_WIN_H_
-#pragma once
 
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/keycodes/keyboard_codes.h b/ui/base/keycodes/keyboard_codes.h
index 53cf8ff..19d6e38 100644
--- a/ui/base/keycodes/keyboard_codes.h
+++ b/ui/base/keycodes/keyboard_codes.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_KEYCODES_KEYBOARD_CODES_H_
 #define UI_BASE_KEYCODES_KEYBOARD_CODES_H_
-#pragma once
 
 #include "build/build_config.h"
 
diff --git a/ui/base/keycodes/keyboard_codes_posix.h b/ui/base/keycodes/keyboard_codes_posix.h
index a2943e7..bfbbacb 100644
--- a/ui/base/keycodes/keyboard_codes_posix.h
+++ b/ui/base/keycodes/keyboard_codes_posix.h
@@ -30,7 +30,6 @@
 
 #ifndef UI_BASE_KEYCODES_KEYBOARD_CODES_POSIX_H_
 #define UI_BASE_KEYCODES_KEYBOARD_CODES_POSIX_H_
-#pragma once
 
 namespace ui {
 
diff --git a/ui/base/keycodes/keyboard_codes_win.h b/ui/base/keycodes/keyboard_codes_win.h
index c13a942..2150b823 100644
--- a/ui/base/keycodes/keyboard_codes_win.h
+++ b/ui/base/keycodes/keyboard_codes_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_KEYCODES_KEYBOARD_CODES_WIN_H_
 #define UI_BASE_KEYCODES_KEYBOARD_CODES_WIN_H_
-#pragma once
 
 #include <windows.h>
 #include <ime.h>
diff --git a/ui/base/l10n/l10n_font_util.h b/ui/base/l10n/l10n_font_util.h
index 6688d31..cfd0d81 100644
--- a/ui/base/l10n/l10n_font_util.h
+++ b/ui/base/l10n/l10n_font_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_L10N_FONT_UTIL_H_
 #define UI_BASE_L10N_FONT_UTIL_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 #include "ui/gfx/size.h"
diff --git a/ui/base/l10n/l10n_util.h b/ui/base/l10n/l10n_util.h
index 2eae6de..777ce757 100644
--- a/ui/base/l10n/l10n_util.h
+++ b/ui/base/l10n/l10n_util.h
@@ -7,7 +7,6 @@
 
 #ifndef UI_BASE_L10N_L10N_UTIL_H_
 #define UI_BASE_L10N_L10N_UTIL_H_
-#pragma once
 
 #include <string>
 #include <vector>
diff --git a/ui/base/l10n/l10n_util_collator.h b/ui/base/l10n/l10n_util_collator.h
index 04a5272..4952d1e 100644
--- a/ui/base/l10n/l10n_util_collator.h
+++ b/ui/base/l10n/l10n_util_collator.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_L10N_L10N_UTIL_COLLATOR_H_
 #define UI_BASE_L10N_L10N_UTIL_COLLATOR_H_
-#pragma once
 
 #include <algorithm>
 #include <functional>
diff --git a/ui/base/l10n/l10n_util_mac.h b/ui/base/l10n/l10n_util_mac.h
index cdb044f..274f33c 100644
--- a/ui/base/l10n/l10n_util_mac.h
+++ b/ui/base/l10n/l10n_util_mac.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_L10N_L10N_UTIL_MAC_H_
 #define UI_BASE_L10N_L10N_UTIL_MAC_H_
-#pragma once
 
 #include <string>
 #include <vector>
diff --git a/ui/base/l10n/l10n_util_win.h b/ui/base/l10n/l10n_util_win.h
index 1063a1a..d7f47dc 100644
--- a/ui/base/l10n/l10n_util_win.h
+++ b/ui/base/l10n/l10n_util_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_L10N_L10N_UTIL_WIN_H_
 #define UI_BASE_L10N_L10N_UTIL_WIN_H_
-#pragma once
 
 #include <windows.h>
 #include <string>
diff --git a/ui/base/layout.h b/ui/base/layout.h
index 6504e08..2349693 100644
--- a/ui/base/layout.h
+++ b/ui/base/layout.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_LAYOUT_H_
 #define UI_BASE_LAYOUT_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/linux_ui.h b/ui/base/linux_ui.h
index 14ce9dc..5332720 100644
--- a/ui/base/linux_ui.h
+++ b/ui/base/linux_ui.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_LINUX_UI_H_
 #define UI_BASE_LINUX_UI_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 #include "third_party/skia/include/core/SkColor.h"
diff --git a/ui/base/models/button_menu_item_model.h b/ui/base/models/button_menu_item_model.h
index 877d395..a9ef808 100644
--- a/ui/base/models/button_menu_item_model.h
+++ b/ui/base/models/button_menu_item_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_BUTTON_MENU_ITEM_MODEL_H_
 #define UI_BASE_MODELS_BUTTON_MENU_ITEM_MODEL_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/models/combobox_model.h b/ui/base/models/combobox_model.h
index 81fb048..a746e53 100644
--- a/ui/base/models/combobox_model.h
+++ b/ui/base/models/combobox_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_COMBOBOX_MODEL_H_
 #define UI_BASE_MODELS_COMBOBOX_MODEL_H_
-#pragma once
 
 #include "base/string16.h"
 
diff --git a/ui/base/models/list_model.h b/ui/base/models/list_model.h
index 16d0d81..95883fc 100644
--- a/ui/base/models/list_model.h
+++ b/ui/base/models/list_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_LIST_MODEL_H_
 #define UI_BASE_MODELS_LIST_MODEL_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/logging.h"
diff --git a/ui/base/models/list_model_observer.h b/ui/base/models/list_model_observer.h
index 49d4030..4b31cb1 100644
--- a/ui/base/models/list_model_observer.h
+++ b/ui/base/models/list_model_observer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_LIST_MODEL_OBSERVER_H_
 #define UI_BASE_MODELS_LIST_MODEL_OBSERVER_H_
-#pragma once
 
 #include <stddef.h>
 
diff --git a/ui/base/models/menu_model.h b/ui/base/models/menu_model.h
index f7acb16..a684253 100644
--- a/ui/base/models/menu_model.h
+++ b/ui/base/models/menu_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_MENU_MODEL_H_
 #define UI_BASE_MODELS_MENU_MODEL_H_
-#pragma once
 
 #include "base/string16.h"
 #include "ui/base/models/menu_model_delegate.h"
diff --git a/ui/base/models/menu_model_delegate.h b/ui/base/models/menu_model_delegate.h
index 9516e59..9e2e335 100644
--- a/ui/base/models/menu_model_delegate.h
+++ b/ui/base/models/menu_model_delegate.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_MENU_MODEL_DELEGATE_H_
 #define UI_BASE_MODELS_MENU_MODEL_DELEGATE_H_
-#pragma once
 
 namespace ui {
 
diff --git a/ui/base/models/simple_menu_model.h b/ui/base/models/simple_menu_model.h
index e7c41d9..126d44b 100644
--- a/ui/base/models/simple_menu_model.h
+++ b/ui/base/models/simple_menu_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_SIMPLE_MENU_MODEL_H_
 #define UI_BASE_MODELS_SIMPLE_MENU_MODEL_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/models/table_model.h b/ui/base/models/table_model.h
index 0565cd8..04b2f0d 100644
--- a/ui/base/models/table_model.h
+++ b/ui/base/models/table_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_TABLE_MODEL_H_
 #define UI_BASE_MODELS_TABLE_MODEL_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/models/table_model_observer.h b/ui/base/models/table_model_observer.h
index 38fca30..21ee645 100644
--- a/ui/base/models/table_model_observer.h
+++ b/ui/base/models/table_model_observer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_TABLE_MODEL_OBSERVER_H_
 #define UI_BASE_MODELS_TABLE_MODEL_OBSERVER_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/models/tree_model.h b/ui/base/models/tree_model.h
index 11ea193..52abded 100644
--- a/ui/base/models/tree_model.h
+++ b/ui/base/models/tree_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_TREE_MODEL_H_
 #define UI_BASE_MODELS_TREE_MODEL_H_
-#pragma once
 
 #include <vector>
 
diff --git a/ui/base/models/tree_node_iterator.h b/ui/base/models/tree_node_iterator.h
index 5a05df9..48843cf 100644
--- a/ui/base/models/tree_node_iterator.h
+++ b/ui/base/models/tree_node_iterator.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_TREE_NODE_ITERATOR_H_
 #define UI_BASE_MODELS_TREE_NODE_ITERATOR_H_
-#pragma once
 
 #include <stack>
 
diff --git a/ui/base/models/tree_node_model.h b/ui/base/models/tree_node_model.h
index 1af826f..0570691 100644
--- a/ui/base/models/tree_node_model.h
+++ b/ui/base/models/tree_node_model.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_MODELS_TREE_NODE_MODEL_H_
 #define UI_BASE_MODELS_TREE_NODE_MODEL_H_
-#pragma once
 
 #include <algorithm>
 #include <vector>
diff --git a/ui/base/native_theme/native_theme.h b/ui/base/native_theme/native_theme.h
index 7a7af67..4ab8e35 100644
--- a/ui/base/native_theme/native_theme.h
+++ b/ui/base/native_theme/native_theme.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_H_
 #define UI_BASE_NATIVE_THEME_NATIVE_THEME_H_
-#pragma once
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/native_theme/native_theme_android.h b/ui/base/native_theme/native_theme_android.h
index 8320f51..8e0ec98 100644
--- a/ui/base/native_theme/native_theme_android.h
+++ b/ui/base/native_theme/native_theme_android.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_ANDROID_H_
 #define UI_BASE_NATIVE_THEME_NATIVE_THEME_ANDROID_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
diff --git a/ui/base/native_theme/native_theme_aura.h b/ui/base/native_theme/native_theme_aura.h
index 077a42a..20a6317 100644
--- a/ui/base/native_theme/native_theme_aura.h
+++ b/ui/base/native_theme/native_theme_aura.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_AURA_H_
 #define UI_BASE_NATIVE_THEME_NATIVE_THEME_AURA_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
diff --git a/ui/base/native_theme/native_theme_base.h b/ui/base/native_theme/native_theme_base.h
index 706a783..4e892ca 100644
--- a/ui/base/native_theme/native_theme_base.h
+++ b/ui/base/native_theme/native_theme_base.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_BASE_H_
 #define UI_BASE_NATIVE_THEME_NATIVE_THEME_BASE_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
diff --git a/ui/base/native_theme/native_theme_gtk.h b/ui/base/native_theme/native_theme_gtk.h
index 257d49f..59b62e8 100644
--- a/ui/base/native_theme/native_theme_gtk.h
+++ b/ui/base/native_theme/native_theme_gtk.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_GTK_H_
 #define UI_BASE_NATIVE_THEME_NATIVE_THEME_GTK_H_
-#pragma once
 
 #include "ui/base/native_theme/native_theme_base.h"
 
diff --git a/ui/base/native_theme/native_theme_win.h b/ui/base/native_theme/native_theme_win.h
index 260de8d..b68952d 100644
--- a/ui/base/native_theme/native_theme_win.h
+++ b/ui/base/native_theme/native_theme_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_WIN_H_
 #define UI_BASE_NATIVE_THEME_NATIVE_THEME_WIN_H_
-#pragma once
 
 // A wrapper class for working with custom XP/Vista themes provided in
 // uxtheme.dll.  This is a singleton class that can be grabbed using
diff --git a/ui/base/range/range.h b/ui/base/range/range.h
index 018a11c..dac8d15 100644
--- a/ui/base/range/range.h
+++ b/ui/base/range/range.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_RANGE_RANGE_H_
 #define UI_BASE_RANGE_RANGE_H_
-#pragma once
 
 #include <string>
 
diff --git a/ui/base/resource/data_pack.h b/ui/base/resource/data_pack.h
index 4a265e5..08947af 100644
--- a/ui/base/resource/data_pack.h
+++ b/ui/base/resource/data_pack.h
@@ -8,7 +8,6 @@
 
 #ifndef UI_BASE_RESOURCE_DATA_PACK_H_
 #define UI_BASE_RESOURCE_DATA_PACK_H_
-#pragma once
 
 #include <map>
 
diff --git a/ui/base/resource/resource_bundle.h b/ui/base/resource/resource_bundle.h
index 597102e..5eb6104 100644
--- a/ui/base/resource/resource_bundle.h
+++ b/ui/base/resource/resource_bundle.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
-#pragma once
 
 #include "build/build_config.h"
 
diff --git a/ui/base/resource/resource_bundle_win.h b/ui/base/resource/resource_bundle_win.h
index 207b90c..9a75bed 100644
--- a/ui/base/resource/resource_bundle_win.h
+++ b/ui/base/resource/resource_bundle_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_RESOURCE_RESOURCE_BUNDLE_WIN_
 #define UI_BASE_RESOURCE_RESOURCE_BUNDLE_WIN_
-#pragma once
 
 #include "build/build_config.h"
 
diff --git a/ui/base/resource/resource_data_dll_win.h b/ui/base/resource/resource_data_dll_win.h
index a38dd54..d45ac83 100644
--- a/ui/base/resource/resource_data_dll_win.h
+++ b/ui/base/resource/resource_data_dll_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_RESOURCE_RESOURCE_DATA_DLL_WIN_H_
 #define UI_BASE_RESOURCE_RESOURCE_DATA_DLL_WIN_H_
-#pragma once
 
 #include <windows.h>
 
diff --git a/ui/base/resource/resource_handle.h b/ui/base/resource/resource_handle.h
index 1d26e72..267e232 100644
--- a/ui/base/resource/resource_handle.h
+++ b/ui/base/resource/resource_handle.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/string_piece.h"
diff --git a/ui/base/test/cocoa_test_event_utils.h b/ui/base/test/cocoa_test_event_utils.h
index a16aa63..0153aaf 100644
--- a/ui/base/test/cocoa_test_event_utils.h
+++ b/ui/base/test/cocoa_test_event_utils.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_TEST_COCOA_TEST_EVENT_UTILS_H_
 #define UI_BASE_TEST_COCOA_TEST_EVENT_UTILS_H_
-#pragma once
 
 #include <utility>
 
diff --git a/ui/base/test/data/resource.h b/ui/base/test/data/resource.h
index bb82442..9043b38 100644
--- a/ui/base/test/data/resource.h
+++ b/ui/base/test/data/resource.h
@@ -20,7 +20,6 @@
 #ifdef APSTUDIO_INVOKED
 #ifndef APSTUDIO_READONLY_SYMBOLS
 #define _APS_NEXT_RESOURCE_VALUE        108
-#pragma once
 #define _APS_NEXT_COMMAND_VALUE         40001
 #define _APS_NEXT_CONTROL_VALUE         1001
 #define _APS_NEXT_SYMED_VALUE           101
diff --git a/ui/base/test/ui_cocoa_test_helper.h b/ui/base/test/ui_cocoa_test_helper.h
index ba0d504..ff24a2f 100644
--- a/ui/base/test/ui_cocoa_test_helper.h
+++ b/ui/base/test/ui_cocoa_test_helper.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_TEST_UI_COCOA_TEST_HELPER_H_
 #define UI_BASE_TEST_UI_COCOA_TEST_HELPER_H_
-#pragma once
 
 #include <set>
 
diff --git a/ui/base/text/bytes_formatting.h b/ui/base/text/bytes_formatting.h
index 024c25d..23dc30c 100644
--- a/ui/base/text/bytes_formatting.h
+++ b/ui/base/text/bytes_formatting.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_TEXT_BYTES_FORMATTING_H_
 #define UI_BASE_TEXT_BYTES_FORMATTING_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
diff --git a/ui/base/text/text_elider.h b/ui/base/text/text_elider.h
index 68c392f..20e202d 100644
--- a/ui/base/text/text_elider.h
+++ b/ui/base/text/text_elider.h
@@ -6,7 +6,6 @@
 
 #ifndef UI_BASE_TEXT_TEXT_ELIDER_H_
 #define UI_BASE_TEXT_TEXT_ELIDER_H_
-#pragma once
 
 #include <string>
 #include <vector>
diff --git a/ui/base/text/utf16_indexing.h b/ui/base/text/utf16_indexing.h
index 4c4656d..1733938 100644
--- a/ui/base/text/utf16_indexing.h
+++ b/ui/base/text/utf16_indexing.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_TEXT_UTF16_INDEXING_H_
 #define UI_BASE_TEXT_UTF16_INDEXING_H_
-#pragma once
 
 #include "base/string16.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/theme_provider.h b/ui/base/theme_provider.h
index 4aec13d..7b59e11 100644
--- a/ui/base/theme_provider.h
+++ b/ui/base/theme_provider.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_THEME_PROVIDER_H_
 #define UI_BASE_THEME_PROVIDER_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
diff --git a/ui/base/touch/touch_factory.h b/ui/base/touch/touch_factory.h
index b12538e..7cad9d1 100644
--- a/ui/base/touch/touch_factory.h
+++ b/ui/base/touch/touch_factory.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_TOUCH_TOUCH_FACTORY_H_
 #define UI_BASE_TOUCH_TOUCH_FACTORY_H_
-#pragma once
 
 #include <bitset>
 #include <map>
diff --git a/ui/base/ui_base_paths.h b/ui/base/ui_base_paths.h
index 7ca95bc..47a7a42 100644
--- a/ui/base/ui_base_paths.h
+++ b/ui/base/ui_base_paths.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_UI_BASE_PATHS_H_
 #define UI_BASE_UI_BASE_PATHS_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/ui_base_switches.h b/ui/base/ui_base_switches.h
index 74ec9587..92d532c 100644
--- a/ui/base/ui_base_switches.h
+++ b/ui/base/ui_base_switches.h
@@ -6,7 +6,6 @@
 
 #ifndef UI_BASE_UI_BASE_SWITCHES_H_
 #define UI_BASE_UI_BASE_SWITCHES_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/ui_base_types.h b/ui/base/ui_base_types.h
index 2708dfe..97a8d44 100644
--- a/ui/base/ui_base_types.h
+++ b/ui/base/ui_base_types.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_UI_BASE_TYPES_H_
 #define UI_BASE_UI_BASE_TYPES_H_
-#pragma once
 
 namespace ui {
 
diff --git a/ui/base/ui_export.h b/ui/base/ui_export.h
index 60fc994..ba05e33 100644
--- a/ui/base/ui_export.h
+++ b/ui/base/ui_export.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_UI_EXPORT_H_
 #define UI_UI_EXPORT_H_
-#pragma once
 
 // Defines UI_EXPORT so that functionality implemented by the UI module can be
 // exported to consumers.
diff --git a/ui/base/view_prop.h b/ui/base/view_prop.h
index 68b8561..eae6792 100644
--- a/ui/base/view_prop.h
+++ b/ui/base/view_prop.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_VIEW_PROP_H_
 #define UI_BASE_VIEW_PROP_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
diff --git a/ui/base/win/accessibility_misc_utils.h b/ui/base/win/accessibility_misc_utils.h
index 1613c77..3789efb 100644
--- a/ui/base/win/accessibility_misc_utils.h
+++ b/ui/base/win/accessibility_misc_utils.h
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 #ifndef UI_BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_
 #define UI_BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_
-#pragma once
 
 #include <atlbase.h>
 #include <atlcom.h>
diff --git a/ui/base/win/atl_module.h b/ui/base/win/atl_module.h
index 3fe3be9..1d1adb4 100644
--- a/ui/base/win/atl_module.h
+++ b/ui/base/win/atl_module.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_ATL_MODULE_H_
 #define UI_BASE_WIN_ATL_MODULE_H_
-#pragma once
 
 #include <atlbase.h>
 #include <atlcom.h>
diff --git a/ui/base/win/dpi.h b/ui/base/win/dpi.h
index 2bb698e..930922a 100644
--- a/ui/base/win/dpi.h
+++ b/ui/base/win/dpi.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_DPI_H_
 #define UI_BASE_WIN_DPI_H_
-#pragma once
 
 #include "ui/gfx/size.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/win/extra_sdk_defines.h b/ui/base/win/extra_sdk_defines.h
index fdc108f..455791e 100644
--- a/ui/base/win/extra_sdk_defines.h
+++ b/ui/base/win/extra_sdk_defines.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_EXTRA_SDK_DEFINES_H_
 #define UI_BASE_WIN_EXTRA_SDK_DEFINES_H_
-#pragma once
 
 #include <windows.h>
 #include <winuser.h>
diff --git a/ui/base/win/foreground_helper.h b/ui/base/win/foreground_helper.h
index a630828..7fc1834 100644
--- a/ui/base/win/foreground_helper.h
+++ b/ui/base/win/foreground_helper.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_FOREGROUND_HELPER_H_
 #define UI_BASE_WIN_FOREGROUND_HELPER_H_
-#pragma once
 
 #include "base/logging.h"
 #include "ui/base/win/window_impl.h"
diff --git a/ui/base/win/hwnd_subclass.h b/ui/base/win/hwnd_subclass.h
index 597ab56..834a45a 100644
--- a/ui/base/win/hwnd_subclass.h
+++ b/ui/base/win/hwnd_subclass.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_HWND_SUBCLASS_H_
 #define UI_BASE_WIN_HWND_SUBCLASS_H_
-#pragma once
 
 #include <vector>
 #include <windows.h>
diff --git a/ui/base/win/hwnd_util.h b/ui/base/win/hwnd_util.h
index 09f777a..6339d4c 100644
--- a/ui/base/win/hwnd_util.h
+++ b/ui/base/win/hwnd_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_HWND_UTIL_H_
 #define UI_BASE_WIN_HWND_UTIL_H_
-#pragma once
 
 #include <windows.h>
 
diff --git a/ui/base/win/ime_input.h b/ui/base/win/ime_input.h
index ad0e517..dc629e8 100644
--- a/ui/base/win/ime_input.h
+++ b/ui/base/win/ime_input.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_IME_INPUT_H_
 #define UI_BASE_WIN_IME_INPUT_H_
-#pragma once
 
 #include <windows.h>
 
diff --git a/ui/base/win/message_box_win.h b/ui/base/win/message_box_win.h
index 49f15ed..d76cf9e 100644
--- a/ui/base/win/message_box_win.h
+++ b/ui/base/win/message_box_win.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_MESSAGE_BOX_WIN_H_
 #define UI_BASE_WIN_MESSAGE_BOX_WIN_H_
-#pragma once
 
 #include <windows.h>
 
diff --git a/ui/base/win/mouse_wheel_util.h b/ui/base/win/mouse_wheel_util.h
index d785265..d6266d7 100644
--- a/ui/base/win/mouse_wheel_util.h
+++ b/ui/base/win/mouse_wheel_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_
 #define UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_
-#pragma once
 
 #include <windows.h>
 
diff --git a/ui/base/win/scoped_ole_initializer.h b/ui/base/win/scoped_ole_initializer.h
index 11cc461..bdf1c3e 100644
--- a/ui/base/win/scoped_ole_initializer.h
+++ b/ui/base/win/scoped_ole_initializer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_SCOPED_OLE_INITIALIZER_H_
 #define UI_BASE_WIN_SCOPED_OLE_INITIALIZER_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
diff --git a/ui/base/win/scoped_set_map_mode.h b/ui/base/win/scoped_set_map_mode.h
index dce7aa3..bf2b78d 100644
--- a/ui/base/win/scoped_set_map_mode.h
+++ b/ui/base/win/scoped_set_map_mode.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_SCOPED_SET_MAP_MODE_H_
 #define UI_BASE_WIN_SCOPED_SET_MAP_MODE_H_
-#pragma once
 
 #include <windows.h>
 
diff --git a/ui/base/win/shell.h b/ui/base/win/shell.h
index 67e40be..eea303d 100644
--- a/ui/base/win/shell.h
+++ b/ui/base/win/shell.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_SHELL_H_
 #define UI_BASE_WIN_SHELL_H_
-#pragma once
 
 #include <windows.h>
 
diff --git a/ui/base/win/singleton_hwnd.h b/ui/base/win/singleton_hwnd.h
index 44ae699..a84b6c0 100644
--- a/ui/base/win/singleton_hwnd.h
+++ b/ui/base/win/singleton_hwnd.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_SINGLETON_HWND_H_
 #define UI_BASE_WIN_SINGLETON_HWND_H_
-#pragma once
 
 #include <windows.h>
 #include <vector>
diff --git a/ui/base/win/window_impl.h b/ui/base/win/window_impl.h
index f4795cb..ca4c473 100644
--- a/ui/base/win/window_impl.h
+++ b/ui/base/win/window_impl.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WIN_WINDOW_IMPL_H_
 #define UI_BASE_WIN_WINDOW_IMPL_H_
-#pragma once
 
 #include <atlbase.h>
 #include <atlapp.h>
diff --git a/ui/base/work_area_watcher_observer.h b/ui/base/work_area_watcher_observer.h
index dda2cf3..63fbf87 100644
--- a/ui/base/work_area_watcher_observer.h
+++ b/ui/base/work_area_watcher_observer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_WORK_AREA_WATCHER_OBSERVER_H_
 #define UI_BASE_WORK_AREA_WATCHER_OBSERVER_H_
-#pragma once
 
 #include "ui/base/ui_export.h"
 
diff --git a/ui/base/x/active_window_watcher_x.h b/ui/base/x/active_window_watcher_x.h
index 0358ecb..b64edfe 100644
--- a/ui/base/x/active_window_watcher_x.h
+++ b/ui/base/x/active_window_watcher_x.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_
 #define UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
diff --git a/ui/base/x/active_window_watcher_x_observer.h b/ui/base/x/active_window_watcher_x_observer.h
index 5369676..e4c71ea 100644
--- a/ui/base/x/active_window_watcher_x_observer.h
+++ b/ui/base/x/active_window_watcher_x_observer.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_OBSERVER_H_
 #define UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_OBSERVER_H_
-#pragma once
 
 #include <gdk/gdk.h>
 
diff --git a/ui/base/x/root_window_property_watcher_x.h b/ui/base/x/root_window_property_watcher_x.h
index 6684e83..f77c2bc 100644
--- a/ui/base/x/root_window_property_watcher_x.h
+++ b/ui/base/x/root_window_property_watcher_x.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_X_ROOT_WINDOW_PROPERTY_WATCHER_X_H_
 #define UI_BASE_X_ROOT_WINDOW_PROPERTY_WATCHER_X_H_
-#pragma once
 
 #include <gdk/gdk.h>
 
diff --git a/ui/base/x/work_area_watcher_x.h b/ui/base/x/work_area_watcher_x.h
index 6412693..99a7849 100644
--- a/ui/base/x/work_area_watcher_x.h
+++ b/ui/base/x/work_area_watcher_x.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_X_WORK_AREA_WATCHER_X_H_
 #define UI_BASE_X_WORK_AREA_WATCHER_X_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
diff --git a/ui/base/x/x11_util.h b/ui/base/x/x11_util.h
index f0ee270..c555d05 100644
--- a/ui/base/x/x11_util.h
+++ b/ui/base/x/x11_util.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_X_X11_UTIL_H_
 #define UI_BASE_X_X11_UTIL_H_
-#pragma once
 
 // This file declares utility functions for X11 (Linux only).
 //
diff --git a/ui/base/x/x11_util_internal.h b/ui/base/x/x11_util_internal.h
index 70eb088..b6816c7 100644
--- a/ui/base/x/x11_util_internal.h
+++ b/ui/base/x/x11_util_internal.h
@@ -4,7 +4,6 @@
 
 #ifndef UI_BASE_X_X11_UTIL_INTERNAL_H_
 #define UI_BASE_X_X11_UTIL_INTERNAL_H_
-#pragma once
 
 // This file declares utility functions for X11 (Linux only).
 //