`#pragma once` for app, base, chrome, gfx, ipc, net, skia, views

BUG=50273
TEST=everything still builds, build is 10% faster on windows, same speed on mac/linux

TBR: erg

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53716 0039d316-1c4b-4281-b951-d872f2087c98

144 files changed, 144 insertions, 0 deletions

diff --git a/chrome/common/about_handler.h b/chrome/common/about_handler.h
index f5d0818..d3c74f4 100644
--- a/chrome/common/about_handler.h
+++ b/chrome/common/about_handler.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_ABOUT_HANDLER_H__
 #define CHROME_COMMON_ABOUT_HANDLER_H__
+#pragma once
 
 #include "chrome/common/url_constants.h"
 #include "googleurl/src/gurl.h"
diff --git a/chrome/common/app_mode_common_mac.h b/chrome/common/app_mode_common_mac.h
index 046324ab..130fe8a 100644
--- a/chrome/common/app_mode_common_mac.h
+++ b/chrome/common/app_mode_common_mac.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_APP_MODE_COMMON_MAC_H_
 #define CHROME_COMMON_APP_MODE_COMMON_MAC_H_
+#pragma once
 
 #include <CoreFoundation/CoreFoundation.h>
 
diff --git a/chrome/common/appcache/appcache_backend_proxy.h b/chrome/common/appcache/appcache_backend_proxy.h
index 2ef2660..9c237d8 100644
--- a/chrome/common/appcache/appcache_backend_proxy.h
+++ b/chrome/common/appcache/appcache_backend_proxy.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_APPCACHE_APPCACHE_BACKEND_PROXY_H_
 #define CHROME_COMMON_APPCACHE_APPCACHE_BACKEND_PROXY_H_
+#pragma once
 
 #include "ipc/ipc_message.h"
 #include "webkit/appcache/appcache_interfaces.h"
diff --git a/chrome/common/appcache/appcache_dispatcher.h b/chrome/common/appcache/appcache_dispatcher.h
index d21be54..2e17349 100644
--- a/chrome/common/appcache/appcache_dispatcher.h
+++ b/chrome/common/appcache/appcache_dispatcher.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_APPCACHE_APPCACHE_DISPATCHER_H_
 #define CHROME_COMMON_APPCACHE_APPCACHE_DISPATCHER_H_
+#pragma once
 
 #include <vector>
 #include "chrome/common/appcache/appcache_backend_proxy.h"
diff --git a/chrome/common/automation_constants.h b/chrome/common/automation_constants.h
index 9c31bd1..1b48e82 100644
--- a/chrome/common/automation_constants.h
+++ b/chrome/common/automation_constants.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_AUTOMATION_CONSTANTS_H__
 #define CHROME_COMMON_AUTOMATION_CONSTANTS_H__
+#pragma once
 
 namespace automation {
 // JSON value labels for proxy settings that are passed in via
diff --git a/chrome/common/bindings_policy.h b/chrome/common/bindings_policy.h
index eccce17..0df8371 100644
--- a/chrome/common/bindings_policy.h
+++ b/chrome/common/bindings_policy.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_BINDINGS_POLICY_H__
 #define CHROME_COMMON_BINDINGS_POLICY_H__
+#pragma once
 
 // This is a utility class that specifies flag values for the types of
 // JavaScript bindings exposed to renderers.
diff --git a/chrome/common/child_process.h b/chrome/common/child_process.h
index fb2c660..7b8e500 100644
--- a/chrome/common/child_process.h
+++ b/chrome/common/child_process.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHILD_PROCESS_H__
 #define CHROME_COMMON_CHILD_PROCESS_H__
+#pragma once
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
diff --git a/chrome/common/child_process_host.h b/chrome/common/child_process_host.h
index 865a1ac..8628acc 100644
--- a/chrome/common/child_process_host.h
+++ b/chrome/common/child_process_host.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHILD_PROCESS_HOST_H_
 #define CHROME_COMMON_CHILD_PROCESS_HOST_H_
+#pragma once
 
 #include <list>
 #include <string>
diff --git a/chrome/common/child_process_info.h b/chrome/common/child_process_info.h
index bc36c18..7d3b34d 100644
--- a/chrome/common/child_process_info.h
+++ b/chrome/common/child_process_info.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHILD_PROCESS_INFO_H_
 #define CHROME_COMMON_CHILD_PROCESS_INFO_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/child_process_logging.h b/chrome/common/child_process_logging.h
index 84a288c..ec5d2c5 100644
--- a/chrome/common/child_process_logging.h
+++ b/chrome/common/child_process_logging.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHILD_PROCESS_LOGGING_H_
 #define CHROME_COMMON_CHILD_PROCESS_LOGGING_H_
+#pragma once
 
 #include <set>
 #include <string>
diff --git a/chrome/common/child_thread.h b/chrome/common/child_thread.h
index 72af5aa..b170d7d 100644
--- a/chrome/common/child_thread.h
+++ b/chrome/common/child_thread.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHILD_THREAD_H_
 #define CHROME_COMMON_CHILD_THREAD_H_
+#pragma once
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
diff --git a/chrome/common/chrome_constants.h b/chrome/common/chrome_constants.h
index 84d6052..9f0704f 100644
--- a/chrome/common/chrome_constants.h
+++ b/chrome/common/chrome_constants.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_CHROME_CONSTANTS_H_
 #define CHROME_COMMON_CHROME_CONSTANTS_H_
+#pragma once
 
 #include "base/file_path.h"
 
diff --git a/chrome/common/chrome_counters.h b/chrome/common/chrome_counters.h
index 14cfa21..e655b83 100644
--- a/chrome/common/chrome_counters.h
+++ b/chrome/common/chrome_counters.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_CHROME_COUNTERS_H_
 #define CHROME_COMMON_CHROME_COUNTERS_H_
+#pragma once
 
 class StatsCounter;
 class StatsCounterTimer;
diff --git a/chrome/common/chrome_descriptors.h b/chrome/common/chrome_descriptors.h
index 8a4f6ee..d83a017 100644
--- a/chrome/common/chrome_descriptors.h
+++ b/chrome/common/chrome_descriptors.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHROME_DESCRIPTORS_H_
 #define CHROME_COMMON_CHROME_DESCRIPTORS_H_
+#pragma once
 
 #include "ipc/ipc_descriptors.h"
 // This is a list of global descriptor keys to be used with the
diff --git a/chrome/common/chrome_paths.h b/chrome/common/chrome_paths.h
index 2d90e0a..65538a7 100644
--- a/chrome/common/chrome_paths.h
+++ b/chrome/common/chrome_paths.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHROME_PATHS_H__
 #define CHROME_COMMON_CHROME_PATHS_H__
+#pragma once
 
 #include "build/build_config.h"
 
diff --git a/chrome/common/chrome_paths_internal.h b/chrome/common/chrome_paths_internal.h
index 7d731e1..cddb88f 100644
--- a/chrome/common/chrome_paths_internal.h
+++ b/chrome/common/chrome_paths_internal.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHROME_PATHS_INTERNAL_H_
 #define CHROME_COMMON_CHROME_PATHS_INTERNAL_H_
+#pragma once
 
 #include "build/build_config.h"
 #include "base/file_path.h"
diff --git a/chrome/common/chrome_plugin_api.h b/chrome/common/chrome_plugin_api.h
index e5230cd..2b3da55 100644
--- a/chrome/common/chrome_plugin_api.h
+++ b/chrome/common/chrome_plugin_api.h
@@ -12,6 +12,7 @@
 
 #ifndef CHROME_COMMON_CHROME_PLUGIN_API_H__
 #define CHROME_COMMON_CHROME_PLUGIN_API_H__
+#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/chrome/common/chrome_plugin_lib.h b/chrome/common/chrome_plugin_lib.h
index 5027cfc..4a4906f 100644
--- a/chrome/common/chrome_plugin_lib.h
+++ b/chrome/common/chrome_plugin_lib.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHROME_PLUGIN_LIB_H_
 #define CHROME_COMMON_CHROME_PLUGIN_LIB_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/chrome_plugin_util.h b/chrome/common/chrome_plugin_util.h
index 7714a53..88873bb 100644
--- a/chrome/common/chrome_plugin_util.h
+++ b/chrome/common/chrome_plugin_util.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHROME_PLUGIN_UTIL_H_
 #define CHROME_COMMON_CHROME_PLUGIN_UTIL_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/chrome_switches.h b/chrome/common/chrome_switches.h
index f05f5d0..dcd5f4f 100644
--- a/chrome/common/chrome_switches.h
+++ b/chrome/common/chrome_switches.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
+#pragma once
 
 #include "build/build_config.h"
 #include "base/base_switches.h"
diff --git a/chrome/common/chrome_version_info.h b/chrome/common/chrome_version_info.h
index e3bfad71..a539130 100644
--- a/chrome/common/chrome_version_info.h
+++ b/chrome/common/chrome_version_info.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CHROME_VERSION_INFO_H_
 #define CHROME_COMMON_CHROME_VERSION_INFO_H_
+#pragma once
 
 class FileVersionInfo;
 
diff --git a/chrome/common/common_param_traits.h b/chrome/common/common_param_traits.h
index b4ec78e..0ca6bed 100644
--- a/chrome/common/common_param_traits.h
+++ b/chrome/common/common_param_traits.h
@@ -10,6 +10,7 @@
 
 #ifndef CHROME_COMMON_COMMON_PARAM_TRAITS_H_
 #define CHROME_COMMON_COMMON_PARAM_TRAITS_H_
+#pragma once
 
 #include <vector>
 
diff --git a/chrome/common/content_settings.h b/chrome/common/content_settings.h
index 10fdcb5..4731263 100644
--- a/chrome/common/content_settings.h
+++ b/chrome/common/content_settings.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CONTENT_SETTINGS_H_
 #define CHROME_COMMON_CONTENT_SETTINGS_H_
+#pragma once
 
 #include "chrome/common/content_settings_types.h"
 
diff --git a/chrome/common/content_settings_helper.h b/chrome/common/content_settings_helper.h
index 0aa2947..58fb85e 100644
--- a/chrome/common/content_settings_helper.h
+++ b/chrome/common/content_settings_helper.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CONTENT_SETTINGS_HELPER_H_
 #define CHROME_COMMON_CONTENT_SETTINGS_HELPER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/content_settings_types.h b/chrome/common/content_settings_types.h
index 2e2a563..938adbf 100644
--- a/chrome/common/content_settings_types.h
+++ b/chrome/common/content_settings_types.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CONTENT_SETTINGS_TYPES_H_
 #define CHROME_COMMON_CONTENT_SETTINGS_TYPES_H_
+#pragma once
 
 // A particular type of content to care about.  We give the user various types
 // of controls over each of these.
diff --git a/chrome/common/css_colors.h b/chrome/common/css_colors.h
index d952e98..9ba36ba 100644
--- a/chrome/common/css_colors.h
+++ b/chrome/common/css_colors.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_CSS_COLORS_H_
 #define CHROME_COMMON_CSS_COLORS_H_
+#pragma once
 
 #include <utility>
 
diff --git a/chrome/common/database_util.h b/chrome/common/database_util.h
index 9c263af..b297044 100644
--- a/chrome/common/database_util.h
+++ b/chrome/common/database_util.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DATABASE_UTIL_H_
 #define CHROME_COMMON_DATABASE_UTIL_H_
+#pragma once
 
 #include "webkit/glue/webkitclient_impl.h"
 
diff --git a/chrome/common/db_message_filter.h b/chrome/common/db_message_filter.h
index 1cb07d8..1eb0d5c 100644
--- a/chrome/common/db_message_filter.h
+++ b/chrome/common/db_message_filter.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DB_MESSAGE_FILTER_H_
 #define CHROME_COMMON_DB_MESSAGE_FILTER_H_
+#pragma once
 
 #include "ipc/ipc_channel_proxy.h"
 
diff --git a/chrome/common/debug_flags.h b/chrome/common/debug_flags.h
index 231d2ca..9671e47 100644
--- a/chrome/common/debug_flags.h
+++ b/chrome/common/debug_flags.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DEBUG_FLAGS_H__
 #define CHROME_COMMON_DEBUG_FLAGS_H__
+#pragma once
 
 #include "chrome/common/child_process_info.h"
 
diff --git a/chrome/common/default_plugin.h b/chrome/common/default_plugin.h
index e3394e8..6cc8348 100644
--- a/chrome/common/default_plugin.h
+++ b/chrome/common/default_plugin.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DEFAULT_PLUGIN_H_
 #define CHROME_COMMON_DEFAULT_PLUGIN_H_
+#pragma once
 
 namespace chrome {
 
diff --git a/chrome/common/deprecated/event_sys-inl.h b/chrome/common/deprecated/event_sys-inl.h
index 62fa350..5baa6b4 100644
--- a/chrome/common/deprecated/event_sys-inl.h
+++ b/chrome/common/deprecated/event_sys-inl.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DEPRECATED_EVENT_SYS_INL_H_
 #define CHROME_COMMON_DEPRECATED_EVENT_SYS_INL_H_
+#pragma once
 
 #include <map>
 
diff --git a/chrome/common/deprecated/event_sys.h b/chrome/common/deprecated/event_sys.h
index bec8144..be4264a 100644
--- a/chrome/common/deprecated/event_sys.h
+++ b/chrome/common/deprecated/event_sys.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DEPRECATED_EVENT_SYS_H_
 #define CHROME_COMMON_DEPRECATED_EVENT_SYS_H_
+#pragma once
 
 // TODO: This class should be removed or moved to Notifier code.
 // See Bug 42450 (http://code.google.com/p/chromium/issues/detail?id=42450).
diff --git a/chrome/common/desktop_notifications/active_notification_tracker.h b/chrome/common/desktop_notifications/active_notification_tracker.h
index 1676f32..7d02326 100644
--- a/chrome/common/desktop_notifications/active_notification_tracker.h
+++ b/chrome/common/desktop_notifications/active_notification_tracker.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DESKTOP_NOTIFICATIONS_ACTIVE_NOTIFICATION_TRACKER_H_
 #define CHROME_COMMON_DESKTOP_NOTIFICATIONS_ACTIVE_NOTIFICATION_TRACKER_H_
+#pragma once
 
 #include <map>
 
diff --git a/chrome/common/devtools_messages.h b/chrome/common/devtools_messages.h
index a46d72b..b82bb19 100644
--- a/chrome/common/devtools_messages.h
+++ b/chrome/common/devtools_messages.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DEVTOOLS_MESSAGES_H_
 #define CHROME_COMMON_DEVTOOLS_MESSAGES_H_
+#pragma once
 
 #include "ipc/ipc_message_utils.h"
 #include "webkit/glue/devtools_message_data.h"
diff --git a/chrome/common/dom_storage_common.h b/chrome/common/dom_storage_common.h
index 96fc508..3f50e62 100644
--- a/chrome/common/dom_storage_common.h
+++ b/chrome/common/dom_storage_common.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_DOM_STORAGE_COMMON_H_
 #define CHROME_COMMON_DOM_STORAGE_COMMON_H_
+#pragma once
 
 const int64 kLocalStorageNamespaceId = 0;
 const int64 kInvalidSessionStorageNamespaceId = kLocalStorageNamespaceId;
diff --git a/chrome/common/edit_command.h b/chrome/common/edit_command.h
index 4fc373e..f9acb14 100644
--- a/chrome/common/edit_command.h
+++ b/chrome/common/edit_command.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EDIT_COMMAND_H_
 #define CHROME_COMMON_EDIT_COMMAND_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/env_vars.h b/chrome/common/env_vars.h
index 1c5bc5d..e9984d2a 100644
--- a/chrome/common/env_vars.h
+++ b/chrome/common/env_vars.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_ENV_VARS_H__
 #define CHROME_COMMON_ENV_VARS_H__
+#pragma once
 
 namespace env_vars {
 
diff --git a/chrome/common/extensions/extension.h b/chrome/common/extensions/extension.h
index 2d3018b..f81974d 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
+#pragma once
 
 #include <map>
 #include <set>
diff --git a/chrome/common/extensions/extension_action.h b/chrome/common/extensions/extension_action.h
index 6658724..a48de32 100644
--- a/chrome/common/extensions/extension_action.h
+++ b/chrome/common/extensions/extension_action.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_ACTION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_ACTION_H_
+#pragma once
 
 #include <map>
 #include <string>
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index 007c3a0..96cb848 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
+#pragma once
 
 // Keys used in JSON representation of extensions.
 namespace extension_manifest_keys {
diff --git a/chrome/common/extensions/extension_error_utils.h b/chrome/common/extensions/extension_error_utils.h
index 54db8ba..0c9bd4d 100644
--- a/chrome/common/extensions/extension_error_utils.h
+++ b/chrome/common/extensions/extension_error_utils.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_ERROR_UTILS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_ERROR_UTILS_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/extensions/extension_extent.h b/chrome/common/extensions/extension_extent.h
index a0117c5..3fc5469 100644
--- a/chrome/common/extensions/extension_extent.h
+++ b/chrome/common/extensions/extension_extent.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_EXTENT_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_EXTENT_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/extensions/extension_file_util.h b/chrome/common/extensions/extension_file_util.h
index 5f3150b..82c08f4 100644
--- a/chrome/common/extensions/extension_file_util.h
+++ b/chrome/common/extensions/extension_file_util.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_FILE_UTIL_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_FILE_UTIL_H_
+#pragma once
 
 #include <set>
 #include <string>
diff --git a/chrome/common/extensions/extension_l10n_util.h b/chrome/common/extensions/extension_l10n_util.h
index 8bd8dc8..48dc901 100644
--- a/chrome/common/extensions/extension_l10n_util.h
+++ b/chrome/common/extensions/extension_l10n_util.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_L10N_UTIL_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_L10N_UTIL_H_
+#pragma once
 
 #include <set>
 #include <string>
diff --git a/chrome/common/extensions/extension_localization_peer.h b/chrome/common/extensions/extension_localization_peer.h
index 0e0fe1d..439105c 100644
--- a/chrome/common/extensions/extension_localization_peer.h
+++ b/chrome/common/extensions/extension_localization_peer.h
@@ -5,6 +5,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_LOCALIZATION_PEER_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_LOCALIZATION_PEER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/extensions/extension_message_bundle.h b/chrome/common/extensions/extension_message_bundle.h
index 3085b50..2e62649 100644
--- a/chrome/common/extensions/extension_message_bundle.h
+++ b/chrome/common/extensions/extension_message_bundle.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_MESSAGE_BUNDLE_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_MESSAGE_BUNDLE_H_
+#pragma once
 
 #include <map>
 #include <string>
diff --git a/chrome/common/extensions/extension_resource.h b/chrome/common/extensions/extension_resource.h
index 295754e..3d52878 100644
--- a/chrome/common/extensions/extension_resource.h
+++ b/chrome/common/extensions/extension_resource.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/extensions/extension_unpacker.h b/chrome/common/extensions/extension_unpacker.h
index b0a4073..ebe2915 100644
--- a/chrome/common/extensions/extension_unpacker.h
+++ b/chrome/common/extensions/extension_unpacker.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_UNPACKER_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_UNPACKER_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/extensions/update_manifest.h b/chrome/common/extensions/update_manifest.h
index 81bd793..48fe97c 100644
--- a/chrome/common/extensions/update_manifest.h
+++ b/chrome/common/extensions/update_manifest.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_UPDATE_MANIFEST_H_
 #define CHROME_COMMON_EXTENSIONS_UPDATE_MANIFEST_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/extensions/url_pattern.h b/chrome/common/extensions/url_pattern.h
index f6f51ec..de08c45 100644
--- a/chrome/common/extensions/url_pattern.h
+++ b/chrome/common/extensions/url_pattern.h
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 #ifndef CHROME_COMMON_EXTENSIONS_URL_PATTERN_H_
 #define CHROME_COMMON_EXTENSIONS_URL_PATTERN_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/extensions/user_script.h b/chrome/common/extensions/user_script.h
index 6c79019..62f0a64 100644
--- a/chrome/common/extensions/user_script.h
+++ b/chrome/common/extensions/user_script.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_EXTENSIONS_USER_SCRIPT_H_
 #define CHROME_COMMON_EXTENSIONS_USER_SCRIPT_H_
+#pragma once
 
 #include <vector>
 #include <string>
diff --git a/chrome/common/font_descriptor_mac.h b/chrome/common/font_descriptor_mac.h
index 25ae9db..732fc42 100644
--- a/chrome/common/font_descriptor_mac.h
+++ b/chrome/common/font_descriptor_mac.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_FONT_DESCRIPTOR_MAC_H_
 #define CHROME_COMMON_FONT_DESCRIPTOR_MAC_H_
+#pragma once
 
 #include "base/string16.h"
 
diff --git a/chrome/common/font_loader_mac.h b/chrome/common/font_loader_mac.h
index 2ec42bce..a793e5e 100644
--- a/chrome/common/font_loader_mac.h
+++ b/chrome/common/font_loader_mac.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_FONT_LOADER_MAC_H_
 #define CHROME_COMMON_FONT_LOADER_MAC_H_
+#pragma once
 
 #include <ApplicationServices/ApplicationServices.h>
 
diff --git a/chrome/common/gears_api.h b/chrome/common/gears_api.h
index 9aba014..2b2f425 100644
--- a/chrome/common/gears_api.h
+++ b/chrome/common/gears_api.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_GEARS_API_H__
 #define CHROME_COMMON_GEARS_API_H__
+#pragma once
 
 #include "chrome/common/chrome_plugin_api.h"
 
diff --git a/chrome/common/geoposition.h b/chrome/common/geoposition.h
index f2db64c..6b19275 100644
--- a/chrome/common/geoposition.h
+++ b/chrome/common/geoposition.h
@@ -8,6 +8,7 @@
 
 #ifndef CHROME_COMMON_GEOPOSITION_H_
 #define CHROME_COMMON_GEOPOSITION_H_
+#pragma once
 
 #include <string>
 #include "base/time.h"
diff --git a/chrome/common/gpu_info.h b/chrome/common/gpu_info.h
index 65b5075..0d512c1 100644
--- a/chrome/common/gpu_info.h
+++ b/chrome/common/gpu_info.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_GPU_INFO_H__
 #define CHROME_COMMON_GPU_INFO_H__
+#pragma once
 
 // Provides access to the GPU information for the system
 // on which chrome is currently running.
diff --git a/chrome/common/gpu_messages.h b/chrome/common/gpu_messages.h
index 16f2860..2e8a8d5 100644
--- a/chrome/common/gpu_messages.h
+++ b/chrome/common/gpu_messages.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_GPU_MESSAGES_H_
 #define CHROME_COMMON_GPU_MESSAGES_H_
+#pragma once
 
 #include <vector>
 
diff --git a/chrome/common/gpu_native_window_handle.h b/chrome/common/gpu_native_window_handle.h
index 11e8cda..cdc89f7 100644
--- a/chrome/common/gpu_native_window_handle.h
+++ b/chrome/common/gpu_native_window_handle.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_GPU_NATIVE_WINDOW_HANDLE_H_
 #define CHROME_COMMON_GPU_NATIVE_WINDOW_HANDLE_H_
+#pragma once
 
 #include "build/build_config.h"
 
diff --git a/chrome/common/gpu_plugin.h b/chrome/common/gpu_plugin.h
index 3fd609e..938cbc2e 100644
--- a/chrome/common/gpu_plugin.h
+++ b/chrome/common/gpu_plugin.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_GPU_PLUGIN_H_
 #define CHROME_COMMON_GPU_PLUGIN_H_
+#pragma once
 
 namespace chrome {
 
diff --git a/chrome/common/important_file_writer.h b/chrome/common/important_file_writer.h
index d4f57a0..a25ad5f 100644
--- a/chrome/common/important_file_writer.h
+++ b/chrome/common/important_file_writer.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_IMPORTANT_FILE_WRITER_H_
 #define CHROME_COMMON_IMPORTANT_FILE_WRITER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/indexed_db_key.h b/chrome/common/indexed_db_key.h
index 13bfae3..9b0662a 100644
--- a/chrome/common/indexed_db_key.h
+++ b/chrome/common/indexed_db_key.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_INDEXED_DB_KEY_H_
 #define CHROME_COMMON_INDEXED_DB_KEY_H_
+#pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
diff --git a/chrome/common/ipc_test_sink.h b/chrome/common/ipc_test_sink.h
index 96e91c0..8fc621a 100644
--- a/chrome/common/ipc_test_sink.h
+++ b/chrome/common/ipc_test_sink.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_IPC_TEST_SINK_H_
 #define CHROME_COMMON_IPC_TEST_SINK_H_
+#pragma once
 
 #include <utility>
 #include <vector>
diff --git a/chrome/common/json_pref_store.h b/chrome/common/json_pref_store.h
index 70f5dee..ed17bbe 100644
--- a/chrome/common/json_pref_store.h
+++ b/chrome/common/json_pref_store.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_JSON_PREF_STORE_H_
 #define CHROME_COMMON_JSON_PREF_STORE_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/json_value_serializer.h b/chrome/common/json_value_serializer.h
index 7919cfe..11b7b7a 100644
--- a/chrome/common/json_value_serializer.h
+++ b/chrome/common/json_value_serializer.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_JSON_VALUE_SERIALIZER_H_
 #define CHROME_COMMON_JSON_VALUE_SERIALIZER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/jstemplate_builder.h b/chrome/common/jstemplate_builder.h
index ac8285f..3eda5a6 100644
--- a/chrome/common/jstemplate_builder.h
+++ b/chrome/common/jstemplate_builder.h
@@ -12,6 +12,7 @@
 
 #ifndef CHROME_COMMON_JSTEMPLATE_BUILDER_H_
 #define CHROME_COMMON_JSTEMPLATE_BUILDER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/libxml_utils.h b/chrome/common/libxml_utils.h
index 1484139..55a935c 100644
--- a/chrome/common/libxml_utils.h
+++ b/chrome/common/libxml_utils.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_LIBXML_UTILS_H__
 #define CHROME_COMMON_LIBXML_UTILS_H__
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/logging_chrome.h b/chrome/common/logging_chrome.h
index 57c3906..a2d62d5e 100644
--- a/chrome/common/logging_chrome.h
+++ b/chrome/common/logging_chrome.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_LOGGING_CHROME_H__
 #define CHROME_COMMON_LOGGING_CHROME_H__
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/mach_message_source_mac.h b/chrome/common/mach_message_source_mac.h
index f57539d..ceced0a 100644
--- a/chrome/common/mach_message_source_mac.h
+++ b/chrome/common/mach_message_source_mac.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_MACH_MESSAGE_SOURCE_MAC_H_
 #define CHROME_COMMON_MACH_MESSAGE_SOURCE_MAC_H_
+#pragma once
 
 #include <CoreServices/CoreServices.h>
 
diff --git a/chrome/common/main_function_params.h b/chrome/common/main_function_params.h
index b224892..6d5291f 100644
--- a/chrome/common/main_function_params.h
+++ b/chrome/common/main_function_params.h
@@ -8,6 +8,7 @@
 
 #ifndef CHROME_COMMON_MAIN_FUNCTION_PARAMS_H_
 #define CHROME_COMMON_MAIN_FUNCTION_PARAMS_H_
+#pragma once
 
 #include "base/command_line.h"
 #include "chrome/common/sandbox_init_wrapper.h"
diff --git a/chrome/common/message_router.h b/chrome/common/message_router.h
index 35d2a5d..13f763c 100644
--- a/chrome/common/message_router.h
+++ b/chrome/common/message_router.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_MESSAGE_ROUTER_H__
 #define CHROME_COMMON_MESSAGE_ROUTER_H__
+#pragma once
 
 #include "base/id_map.h"
 #include "ipc/ipc_channel.h"
diff --git a/chrome/common/metrics_helpers.h b/chrome/common/metrics_helpers.h
index 8051273..a137ecf 100644
--- a/chrome/common/metrics_helpers.h
+++ b/chrome/common/metrics_helpers.h
@@ -7,6 +7,7 @@
 
 #ifndef CHROME_COMMON_METRICS_HELPERS_H_
 #define CHROME_COMMON_METRICS_HELPERS_H_
+#pragma once
 
 #include <map>
 #include <string>
diff --git a/chrome/common/mru_cache.h b/chrome/common/mru_cache.h
index b2643f8..b9b72d4 100644
--- a/chrome/common/mru_cache.h
+++ b/chrome/common/mru_cache.h
@@ -15,6 +15,7 @@
 
 #ifndef CHROME_COMMON_MRU_CACHE_H__
 #define CHROME_COMMON_MRU_CACHE_H__
+#pragma once
 
 #include <list>
 #include <map>
diff --git a/chrome/common/nacl_cmd_line.h b/chrome/common/nacl_cmd_line.h
index 1091e11..cb704b1 100644
--- a/chrome/common/nacl_cmd_line.h
+++ b/chrome/common/nacl_cmd_line.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NACL_CMD_LINE_H_
 #define CHROME_COMMON_NACL_CMD_LINE_H_
+#pragma once
 
 #include "base/command_line.h"
 
diff --git a/chrome/common/nacl_messages.h b/chrome/common/nacl_messages.h
index 8d360dd..43c20c0 100644
--- a/chrome/common/nacl_messages.h
+++ b/chrome/common/nacl_messages.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_NACL_MESSAGES_H_
 #define CHROME_COMMON_NACL_MESSAGES_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/nacl_types.h b/chrome/common/nacl_types.h
index 5c5f5dc..b61d9ef 100644
--- a/chrome/common/nacl_types.h
+++ b/chrome/common/nacl_types.h
@@ -5,6 +5,7 @@
 // Handle passing definitions for NaCl
 #ifndef CHROME_COMMON_NACL_TYPES_H_
 #define CHROME_COMMON_NACL_TYPES_H_
+#pragma once
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
diff --git a/chrome/common/native_web_keyboard_event.h b/chrome/common/native_web_keyboard_event.h
index 381ad31..300a199 100644
--- a/chrome/common/native_web_keyboard_event.h
+++ b/chrome/common/native_web_keyboard_event.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NATIVE_WEB_KEYBOARD_EVENT_H_
 #define CHROME_COMMON_NATIVE_WEB_KEYBOARD_EVENT_H_
+#pragma once
 
 #include "base/basictypes.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebInputEvent.h"
diff --git a/chrome/common/native_window_notification_source.h b/chrome/common/native_window_notification_source.h
index 4cc75b8..a8e5cae 100644
--- a/chrome/common/native_window_notification_source.h
+++ b/chrome/common/native_window_notification_source.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NATIVE_WINDOW_NOTIFICATION_SOURCE_H_
 #define CHROME_COMMON_NATIVE_WINDOW_NOTIFICATION_SOURCE_H_
+#pragma once
 
 #include "chrome/common/notification_source.h"
 #include "gfx/native_widget_types.h"
diff --git a/chrome/common/navigation_gesture.h b/chrome/common/navigation_gesture.h
index bb99497..e27ea4c 100644
--- a/chrome/common/navigation_gesture.h
+++ b/chrome/common/navigation_gesture.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NAVIGATION_GESTURE_H_
 #define CHROME_COMMON_NAVIGATION_GESTURE_H_
+#pragma once
 
 enum NavigationGesture {
   NavigationGestureUser,    // User initiated navigation/load. This is not
diff --git a/chrome/common/navigation_types.h b/chrome/common/navigation_types.h
index c871201..39c2a98 100644
--- a/chrome/common/navigation_types.h
+++ b/chrome/common/navigation_types.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NAVIGATION_TYPES_H_
 #define CHROME_COMMON_NAVIGATION_TYPES_H_
+#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/chrome/common/net/gaia/gaia_auth_consumer.h b/chrome/common/net/gaia/gaia_auth_consumer.h
index b7b215c..d3adf16 100644
--- a/chrome/common/net/gaia/gaia_auth_consumer.h
+++ b/chrome/common/net/gaia/gaia_auth_consumer.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_GAIA_GAIA_AUTH_CONSUMER_H_
 #define CHROME_COMMON_NET_GAIA_GAIA_AUTH_CONSUMER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/net/gaia/gaia_authenticator.h b/chrome/common/net/gaia/gaia_authenticator.h
index 89ab8e9..696f403 100644
--- a/chrome/common/net/gaia/gaia_authenticator.h
+++ b/chrome/common/net/gaia/gaia_authenticator.h
@@ -27,6 +27,7 @@
 // artifacts of the sync code which needs to be cleaned up.
 #ifndef CHROME_COMMON_NET_GAIA_GAIA_AUTHENTICATOR_H_
 #define CHROME_COMMON_NET_GAIA_GAIA_AUTHENTICATOR_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/net/gaia/gaia_authenticator2.h b/chrome/common/net/gaia/gaia_authenticator2.h
index 0e6c203c..38456b0 100644
--- a/chrome/common/net/gaia/gaia_authenticator2.h
+++ b/chrome/common/net/gaia/gaia_authenticator2.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_GAIA_GAIA_AUTHENTICATOR2_H_
 #define CHROME_COMMON_NET_GAIA_GAIA_AUTHENTICATOR2_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/net/gaia/gaia_authenticator2_unittest.h b/chrome/common/net/gaia/gaia_authenticator2_unittest.h
index d392ee8..85d2507 100644
--- a/chrome/common/net/gaia/gaia_authenticator2_unittest.h
+++ b/chrome/common/net/gaia/gaia_authenticator2_unittest.h
@@ -7,6 +7,7 @@
 
 #ifndef CHROME_COMMON_NET_GAIA_GAIA_AUTHENTICATOR2_UNITTEST_H_
 #define CHROME_COMMON_NET_GAIA_GAIA_AUTHENTICATOR2_UNITTEST_H_
+#pragma once
 
 #include "chrome/common/net/gaia/gaia_authenticator2.h"
 #include "chrome/common/net/url_fetcher.h"
diff --git a/chrome/common/net/http_return.h b/chrome/common/net/http_return.h
index f47d1bb..7cb7731 100644
--- a/chrome/common/net/http_return.h
+++ b/chrome/common/net/http_return.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_HTTP_RETURN_H_
 #define CHROME_COMMON_NET_HTTP_RETURN_H_
+#pragma once
 
 // TODO(sanjeevr): This has been moved from the sync library so it only
 // contains a few HTTP return codes. Add more HTTP return codes.
diff --git a/chrome/common/net/net_resource_provider.h b/chrome/common/net/net_resource_provider.h
index 4965adf..c577075 100644
--- a/chrome/common/net/net_resource_provider.h
+++ b/chrome/common/net/net_resource_provider.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_NET_RESOURCE_PROVIDER_H_
 #define CHROME_COMMON_NET_NET_RESOURCE_PROVIDER_H_
+#pragma once
 
 namespace base {
 class StringPiece;
diff --git a/chrome/common/net/predictor_common.h b/chrome/common/net/predictor_common.h
index c1d995f..55653bb 100644
--- a/chrome/common/net/predictor_common.h
+++ b/chrome/common/net/predictor_common.h
@@ -7,6 +7,7 @@
 
 #ifndef CHROME_COMMON_NET_PREDICTOR_COMMON_H_
 #define CHROME_COMMON_NET_PREDICTOR_COMMON_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/net/socket_stream.h b/chrome/common/net/socket_stream.h
index 6c1ad92..6999842 100644
--- a/chrome/common/net/socket_stream.h
+++ b/chrome/common/net/socket_stream.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_SOCKET_STREAM_H_
 #define CHROME_COMMON_NET_SOCKET_STREAM_H_
+#pragma once
 
 namespace chrome_common_net {
 
diff --git a/chrome/common/net/test_url_fetcher_factory.h b/chrome/common/net/test_url_fetcher_factory.h
index 2e4ea45..3d86466 100644
--- a/chrome/common/net/test_url_fetcher_factory.h
+++ b/chrome/common/net/test_url_fetcher_factory.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_TEST_URL_FETCHER_FACTORY_H_
 #define CHROME_COMMON_NET_TEST_URL_FETCHER_FACTORY_H_
+#pragma once
 
 #include <map>
 #include <string>
diff --git a/chrome/common/net/url_fetcher.h b/chrome/common/net/url_fetcher.h
index 9572478..4671ae0 100644
--- a/chrome/common/net/url_fetcher.h
+++ b/chrome/common/net/url_fetcher.h
@@ -9,6 +9,7 @@
 
 #ifndef CHROME_COMMON_NET_URL_FETCHER_H_
 #define CHROME_COMMON_NET_URL_FETCHER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/net/url_fetcher_protect.h b/chrome/common/net/url_fetcher_protect.h
index 0b9c624..95ecf97 100644
--- a/chrome/common/net/url_fetcher_protect.h
+++ b/chrome/common/net/url_fetcher_protect.h
@@ -7,6 +7,7 @@
 
 #ifndef CHROME_COMMON_NET_URL_FETCHER_PROTECT_H_
 #define CHROME_COMMON_NET_URL_FETCHER_PROTECT_H_
+#pragma once
 
 #include <map>
 #include <queue>
diff --git a/chrome/common/net/url_request_context_getter.h b/chrome/common/net/url_request_context_getter.h
index dcc77b3..34aa668 100644
--- a/chrome/common/net/url_request_context_getter.h
+++ b/chrome/common/net/url_request_context_getter.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_URL_REQUEST_CONTEXT_GETTER_H_
 #define CHROME_COMMON_NET_URL_REQUEST_CONTEXT_GETTER_H_
+#pragma once
 
 #include "base/ref_counted.h"
 #include "base/task.h"
diff --git a/chrome/common/net/url_request_intercept_job.h b/chrome/common/net/url_request_intercept_job.h
index 3b7058b..3835fe50 100644
--- a/chrome/common/net/url_request_intercept_job.h
+++ b/chrome/common/net/url_request_intercept_job.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NET_URL_REQUEST_INTERCEPT_JOB_H_
 #define CHROME_COMMON_NET_URL_REQUEST_INTERCEPT_JOB_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/notification_details.h b/chrome/common/notification_details.h
index 92c1906..4d243cf 100644
--- a/chrome/common/notification_details.h
+++ b/chrome/common/notification_details.h
@@ -7,6 +7,7 @@
 
 #ifndef CHROME_COMMON_NOTIFICATION_DETAILS_H__
 #define CHROME_COMMON_NOTIFICATION_DETAILS_H__
+#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/chrome/common/notification_observer.h b/chrome/common/notification_observer.h
index 8ad4d4a..b0af25e 100644
--- a/chrome/common/notification_observer.h
+++ b/chrome/common/notification_observer.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NOTIFICATION_OBSERVER_H_
 #define CHROME_COMMON_NOTIFICATION_OBSERVER_H_
+#pragma once
 
 class NotificationDetails;
 class NotificationSource;
diff --git a/chrome/common/notification_observer_mock.h b/chrome/common/notification_observer_mock.h
index 9eeb665..8bd096e 100644
--- a/chrome/common/notification_observer_mock.h
+++ b/chrome/common/notification_observer_mock.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NOTIFICATION_OBSERVER_MOCK_H_
 #define CHROME_COMMON_NOTIFICATION_OBSERVER_MOCK_H_
+#pragma once
 
 #include "chrome/common/notification_details.h"
 #include "chrome/common/notification_observer.h"
diff --git a/chrome/common/notification_registrar.h b/chrome/common/notification_registrar.h
index f8dd743..eb83712 100644
--- a/chrome/common/notification_registrar.h
+++ b/chrome/common/notification_registrar.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NOTIFICATION_REGISTRAR_H_
 #define CHROME_COMMON_NOTIFICATION_REGISTRAR_H_
+#pragma once
 
 #include <vector>
 
diff --git a/chrome/common/notification_service.h b/chrome/common/notification_service.h
index fefc09c..8945c63 100644
--- a/chrome/common/notification_service.h
+++ b/chrome/common/notification_service.h
@@ -8,6 +8,7 @@
 
 #ifndef CHROME_COMMON_NOTIFICATION_SERVICE_H_
 #define CHROME_COMMON_NOTIFICATION_SERVICE_H_
+#pragma once
 
 #include <map>
 
diff --git a/chrome/common/notification_source.h b/chrome/common/notification_source.h
index 1813c2e..3b4da37 100644
--- a/chrome/common/notification_source.h
+++ b/chrome/common/notification_source.h
@@ -7,6 +7,7 @@
 
 #ifndef CHROME_COMMON_NOTIFICATION_SOURCE_H__
 #define CHROME_COMMON_NOTIFICATION_SOURCE_H__
+#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/chrome/common/notification_type.h b/chrome/common/notification_type.h
index 9f75bb4..9c69e33 100644
--- a/chrome/common/notification_type.h
+++ b/chrome/common/notification_type.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
+#pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
diff --git a/chrome/common/owned_widget_gtk.h b/chrome/common/owned_widget_gtk.h
index 72fadd5..75d87f7 100644
--- a/chrome/common/owned_widget_gtk.h
+++ b/chrome/common/owned_widget_gtk.h
@@ -48,6 +48,7 @@
 
 #ifndef CHROME_COMMON_OWNED_WIDGET_GTK_H_
 #define CHROME_COMMON_OWNED_WIDGET_GTK_H_
+#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/chrome/common/page_transition_types.h b/chrome/common/page_transition_types.h
index 592fc29..71cd386 100644
--- a/chrome/common/page_transition_types.h
+++ b/chrome/common/page_transition_types.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PAGE_TRANSITION_TYPES_H__
 #define CHROME_COMMON_PAGE_TRANSITION_TYPES_H__
+#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/chrome/common/page_zoom.h b/chrome/common/page_zoom.h
index fa2f5bb..0f3ad65 100644
--- a/chrome/common/page_zoom.h
+++ b/chrome/common/page_zoom.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PAGE_ZOOM_H_
 #define CHROME_COMMON_PAGE_ZOOM_H_
+#pragma once
 
 class PageZoom {
  public:
diff --git a/chrome/common/pepper_plugin_registry.h b/chrome/common/pepper_plugin_registry.h
index a728381..90d0d98 100644
--- a/chrome/common/pepper_plugin_registry.h
+++ b/chrome/common/pepper_plugin_registry.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PEPPER_PLUGIN_REGISTRY_H_
 #define CHROME_COMMON_PEPPER_PLUGIN_REGISTRY_H_
+#pragma once
 
 #include <string>
 #include <map>
diff --git a/chrome/common/plugin_carbon_interpose_constants_mac.h b/chrome/common/plugin_carbon_interpose_constants_mac.h
index 321dd84..967da77 100644
--- a/chrome/common/plugin_carbon_interpose_constants_mac.h
+++ b/chrome/common/plugin_carbon_interpose_constants_mac.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PLUGIN_CARBON_INTERPOSE_CONSTANTS_MAC_H_
 #define CHROME_COMMON_PLUGIN_CARBON_INTERPOSE_CONSTANTS_MAC_H_
+#pragma once
 
 #if !defined(__LP64__)
 
diff --git a/chrome/common/plugin_group.h b/chrome/common/plugin_group.h
index f9f6ce3..e1558ff 100644
--- a/chrome/common/plugin_group.h
+++ b/chrome/common/plugin_group.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PLUGIN_GROUP_H_
 #define CHROME_COMMON_PLUGIN_GROUP_H_
+#pragma once
 
 #include <set>
 #include <vector>
diff --git a/chrome/common/plugin_messages.h b/chrome/common/plugin_messages.h
index 82116d8..315a5d3 100644
--- a/chrome/common/plugin_messages.h
+++ b/chrome/common/plugin_messages.h
@@ -9,6 +9,7 @@
 
 #ifndef CHROME_COMMON_PLUGIN_MESSAGES_H_
 #define CHROME_COMMON_PLUGIN_MESSAGES_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/pref_names.h b/chrome/common/pref_names.h
index 0e98f18..0e178ce 100644
--- a/chrome/common/pref_names.h
+++ b/chrome/common/pref_names.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
+#pragma once
 
 #include "build/build_config.h"
 
diff --git a/chrome/common/pref_store.h b/chrome/common/pref_store.h
index 959c412..d5acd89 100644
--- a/chrome/common/pref_store.h
+++ b/chrome/common/pref_store.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PREF_STORE_H_
 #define CHROME_COMMON_PREF_STORE_H_
+#pragma once
 
 class DictionaryValue;
 
diff --git a/chrome/common/process_watcher.h b/chrome/common/process_watcher.h
index f764c4f..f28eca6 100644
--- a/chrome/common/process_watcher.h
+++ b/chrome/common/process_watcher.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PROCESS_WATCHER_H_
 #define CHROME_COMMON_PROCESS_WATCHER_H_
+#pragma once
 
 #include "build/build_config.h"
 
diff --git a/chrome/common/property_bag.h b/chrome/common/property_bag.h
index 778d0b9..dffcf7c 100644
--- a/chrome/common/property_bag.h
+++ b/chrome/common/property_bag.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_PROPERTY_BAG_H_
 #define CHROME_COMMON_PROPERTY_BAG_H_
+#pragma once
 
 #include <map>
 
diff --git a/chrome/common/ref_counted_util.h b/chrome/common/ref_counted_util.h
index b04580e..38d913b 100644
--- a/chrome/common/ref_counted_util.h
+++ b/chrome/common/ref_counted_util.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_REF_COUNTED_UTIL_H__
 #define CHROME_COMMON_REF_COUNTED_UTIL_H__
+#pragma once
 
 #include "base/ref_counted.h"
 #include <vector>
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index eac360f..c94ac98 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_RENDER_MESSAGES_H_
 #define CHROME_COMMON_RENDER_MESSAGES_H_
+#pragma once
 
 #include <map>
 #include <string>
diff --git a/chrome/common/renderer_preferences.h b/chrome/common/renderer_preferences.h
index 7a55b17..dd57866 100644
--- a/chrome/common/renderer_preferences.h
+++ b/chrome/common/renderer_preferences.h
@@ -11,6 +11,7 @@
 
 #ifndef CHROME_COMMON_RENDERER_PREFERENCES_H_
 #define CHROME_COMMON_RENDERER_PREFERENCES_H_
+#pragma once
 
 #include "third_party/skia/include/core/SkColor.h"
 
diff --git a/chrome/common/resource_dispatcher.h b/chrome/common/resource_dispatcher.h
index c98b11a..613b7b5 100644
--- a/chrome/common/resource_dispatcher.h
+++ b/chrome/common/resource_dispatcher.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_RESOURCE_DISPATCHER_H__
 #define CHROME_COMMON_RESOURCE_DISPATCHER_H__
+#pragma once
 
 #include <deque>
 #include <string>
diff --git a/chrome/common/resource_response.h b/chrome/common/resource_response.h
index 1c9b766..368e410d 100644
--- a/chrome/common/resource_response.h
+++ b/chrome/common/resource_response.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_RESOURCE_RESPONSE_H_
 #define CHROME_COMMON_RESOURCE_RESPONSE_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/result_codes.h b/chrome/common/result_codes.h
index 6ca19b8..0b4bc3c 100644
--- a/chrome/common/result_codes.h
+++ b/chrome/common/result_codes.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_RESULT_CODES_H_
 #define CHROME_COMMON_RESULT_CODES_H_
+#pragma once
 
 #include "base/process_util.h"
 
diff --git a/chrome/common/sandbox_init_wrapper.h b/chrome/common/sandbox_init_wrapper.h
index d1652d2..56716fc 100644
--- a/chrome/common/sandbox_init_wrapper.h
+++ b/chrome/common/sandbox_init_wrapper.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SANDBOX_INIT_WRAPPER_H_
 #define CHROME_COMMON_SANDBOX_INIT_WRAPPER_H_
+#pragma once
 
 // Wraps the sandbox initialization and platform variables to consolodate
 // the code and reduce the number of platform ifdefs elsewhere. The POSIX
diff --git a/chrome/common/sandbox_mac.h b/chrome/common/sandbox_mac.h
index 249eaa3..add08a8 100644
--- a/chrome/common/sandbox_mac.h
+++ b/chrome/common/sandbox_mac.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SANDBOX_MAC_H_
 #define CHROME_COMMON_SANDBOX_MAC_H_
+#pragma once
 
 #include "base/file_path.h"
 
diff --git a/chrome/common/sandbox_mac_unittest_helper.h b/chrome/common/sandbox_mac_unittest_helper.h
index 3e24009..adf6401 100644
--- a/chrome/common/sandbox_mac_unittest_helper.h
+++ b/chrome/common/sandbox_mac_unittest_helper.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SANDBOX_MAC_UNITTEST_RUNNER_H_
 #define CHROME_COMMON_SANDBOX_MAC_UNITTEST_RUNNER_H_
+#pragma once
 
 #include "base/multiprocess_test.h"
 #include "chrome/common/sandbox_mac.h"
diff --git a/chrome/common/sandbox_methods_linux.h b/chrome/common/sandbox_methods_linux.h
index 254ba62..08cb00b 100644
--- a/chrome/common/sandbox_methods_linux.h
+++ b/chrome/common/sandbox_methods_linux.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SANDBOX_METHODS_LINUX_H_
 #define CHROME_COMMON_SANDBOX_METHODS_LINUX_H_
+#pragma once
 
 // This is a list of sandbox IPC methods which the renderer may send to the
 // sandbox host. See http://code.google.com/p/chromium/LinuxSandboxIPC
diff --git a/chrome/common/sandbox_policy.h b/chrome/common/sandbox_policy.h
index 46ab7bf..ce8777d 100644
--- a/chrome/common/sandbox_policy.h
+++ b/chrome/common/sandbox_policy.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SANDBOX_POLICY_H_
 #define CHROME_COMMON_SANDBOX_POLICY_H_
+#pragma once
 
 #include "base/process.h"
 #include "base/file_path.h"
diff --git a/chrome/common/security_filter_peer.h b/chrome/common/security_filter_peer.h
index b52af0c..5ab98f1 100644
--- a/chrome/common/security_filter_peer.h
+++ b/chrome/common/security_filter_peer.h
@@ -5,6 +5,7 @@
 
 #ifndef CHROME_COMMON_SECURITY_FILTER_PEER_H__
 #define CHROME_COMMON_SECURITY_FILTER_PEER_H__
+#pragma once
 
 #include "webkit/glue/resource_loader_bridge.h"
 
diff --git a/chrome/common/serialized_script_value.h b/chrome/common/serialized_script_value.h
index e464134..794d410 100644
--- a/chrome/common/serialized_script_value.h
+++ b/chrome/common/serialized_script_value.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SERIALIZED_SCRIPT_VALUE_H_
 #define CHROME_COMMON_SERIALIZED_SCRIPT_VALUE_H_
+#pragma once
 
 #include "base/string16.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebSerializedScriptValue.h"
diff --git a/chrome/common/socket_stream_dispatcher.h b/chrome/common/socket_stream_dispatcher.h
index 8e3bbe4..2640ed4 100644
--- a/chrome/common/socket_stream_dispatcher.h
+++ b/chrome/common/socket_stream_dispatcher.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SOCKET_STREAM_DISPATCHER_H_
 #define CHROME_COMMON_SOCKET_STREAM_DISPATCHER_H_
+#pragma once
 
 #include <vector>
 
diff --git a/chrome/common/spellcheck_common.h b/chrome/common/spellcheck_common.h
index 5c2569e..9074e16 100644
--- a/chrome/common/spellcheck_common.h
+++ b/chrome/common/spellcheck_common.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SPELLCHECK_COMMON_H_
 #define CHROME_COMMON_SPELLCHECK_COMMON_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/sqlite_compiled_statement.h b/chrome/common/sqlite_compiled_statement.h
index 01b7f1e..edc60de 100644
--- a/chrome/common/sqlite_compiled_statement.h
+++ b/chrome/common/sqlite_compiled_statement.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SQLITE_COMPILED_STATEMENT_H_
 #define CHROME_COMMON_SQLITE_COMPILED_STATEMENT_H_
+#pragma once
 
 #include <map>
 #include <string>
diff --git a/chrome/common/sqlite_utils.h b/chrome/common/sqlite_utils.h
index f7351a2..12824a6 100644
--- a/chrome/common/sqlite_utils.h
+++ b/chrome/common/sqlite_utils.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_SQLITE_UTILS_H_
 #define CHROME_COMMON_SQLITE_UTILS_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/task_queue.h b/chrome/common/task_queue.h
index 9e1c817a..9c0b33c 100644
--- a/chrome/common/task_queue.h
+++ b/chrome/common/task_queue.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_TASK_QUEUE_H__
 #define CHROME_COMMON_TASK_QUEUE_H__
+#pragma once
 
 #include <deque>
 
diff --git a/chrome/common/thumbnail_score.h b/chrome/common/thumbnail_score.h
index c3a5a90..30bcf8f 100644
--- a/chrome/common/thumbnail_score.h
+++ b/chrome/common/thumbnail_score.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_THUMBNAIL_SCORE_H_
 #define CHROME_COMMON_THUMBNAIL_SCORE_H_
+#pragma once
 
 #include "base/time.h"
 
diff --git a/chrome/common/time_format.h b/chrome/common/time_format.h
index c04ed62..6045cef 100644
--- a/chrome/common/time_format.h
+++ b/chrome/common/time_format.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_TIME_FORMAT_H__
 #define CHROME_COMMON_TIME_FORMAT_H__
+#pragma once
 
 // This file defines methods to format time values as strings.
 
diff --git a/chrome/common/translate_errors.h b/chrome/common/translate_errors.h
index 1c6ea8a..33e5c3d 100644
--- a/chrome/common/translate_errors.h
+++ b/chrome/common/translate_errors.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_TRANSLATE_ERRORS_H_
 #define CHROME_COMMON_TRANSLATE_ERRORS_H_
+#pragma once
 
 // This file consolidates all the error types for translation of a page.
 
diff --git a/chrome/common/url_constants.h b/chrome/common/url_constants.h
index 216ffb1..f8c6fd4 100644
--- a/chrome/common/url_constants.h
+++ b/chrome/common/url_constants.h
@@ -6,6 +6,7 @@
 
 #ifndef CHROME_COMMON_URL_CONSTANTS_H_
 #define CHROME_COMMON_URL_CONSTANTS_H_
+#pragma once
 
 namespace chrome {
 
diff --git a/chrome/common/utility_messages.h b/chrome/common/utility_messages.h
index 867131f..d5ebe4d 100644
--- a/chrome/common/utility_messages.h
+++ b/chrome/common/utility_messages.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_UTILITY_MESSAGES_H_
 #define CHROME_COMMON_UTILITY_MESSAGES_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/view_types.h b/chrome/common/view_types.h
index 697ebbd..2947a29 100644
--- a/chrome/common/view_types.h
+++ b/chrome/common/view_types.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_VIEW_TYPES_H_
 #define CHROME_COMMON_VIEW_TYPES_H_
+#pragma once
 
 #include "base/basictypes.h"
 
diff --git a/chrome/common/visitedlink_common.h b/chrome/common/visitedlink_common.h
index 546bd4f..f68015f 100644
--- a/chrome/common/visitedlink_common.h
+++ b/chrome/common/visitedlink_common.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_VISITEDLINK_COMMON_H__
 #define CHROME_COMMON_VISITEDLINK_COMMON_H__
+#pragma once
 
 #include <vector>
 
diff --git a/chrome/common/web_database_observer_impl.h b/chrome/common/web_database_observer_impl.h
index 3f5e80b..dced3df 100644
--- a/chrome/common/web_database_observer_impl.h
+++ b/chrome/common/web_database_observer_impl.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_WEB_DATABASE_OBSERVER_IMPL_H_
 #define CHROME_COMMON_WEB_DATABASE_OBSERVER_IMPL_H_
+#pragma once
 
 #include "ipc/ipc_message.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebDatabaseObserver.h"
diff --git a/chrome/common/web_resource/web_resource_unpacker.h b/chrome/common/web_resource/web_resource_unpacker.h
index f07c06f..3b89a61 100644
--- a/chrome/common/web_resource/web_resource_unpacker.h
+++ b/chrome/common/web_resource/web_resource_unpacker.h
@@ -11,6 +11,7 @@
 
 #ifndef CHROME_COMMON_WEB_RESOURCE_WEB_RESOURCE_UNPACKER_H_
 #define CHROME_COMMON_WEB_RESOURCE_WEB_RESOURCE_UNPACKER_H_
+#pragma once
 
 #include <string>
 
diff --git a/chrome/common/webkit_param_traits.h b/chrome/common/webkit_param_traits.h
index e277e38..d6c8ea3 100644
--- a/chrome/common/webkit_param_traits.h
+++ b/chrome/common/webkit_param_traits.h
@@ -22,6 +22,7 @@
 
 #ifndef CHROME_COMMON_WEBKIT_PARAM_TRAITS_H_
 #define CHROME_COMMON_WEBKIT_PARAM_TRAITS_H_
+#pragma once
 
 #include "ipc/ipc_message_utils.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebCache.h"
diff --git a/chrome/common/webmessageportchannel_impl.h b/chrome/common/webmessageportchannel_impl.h
index da52b9d..24e7ddc 100644
--- a/chrome/common/webmessageportchannel_impl.h
+++ b/chrome/common/webmessageportchannel_impl.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_WEBMESSAGEPORTCHANNEL_IMPL_H_
 #define CHROME_COMMON_WEBMESSAGEPORTCHANNEL_IMPL_H_
+#pragma once
 
 #include <queue>
 #include <vector>
diff --git a/chrome/common/win_safe_util.h b/chrome/common/win_safe_util.h
index d9c7097..dee073d 100644
--- a/chrome/common/win_safe_util.h
+++ b/chrome/common/win_safe_util.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_WIN_SAFE_UTIL_H__
 #define CHROME_COMMON_WIN_SAFE_UTIL_H__
+#pragma once
 
 #include <string>
 #include <windows.h>
diff --git a/chrome/common/window_container_type.h b/chrome/common/window_container_type.h
index 303d1cc..5db1d0e 100644
--- a/chrome/common/window_container_type.h
+++ b/chrome/common/window_container_type.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_WINDOW_CONTAINER_TYPE_H_
 #define CHROME_COMMON_WINDOW_CONTAINER_TYPE_H_
+#pragma once
 
 namespace WebKit {
 
diff --git a/chrome/common/worker_messages.h b/chrome/common/worker_messages.h
index 1228ba3..ba2e24d 100644
--- a/chrome/common/worker_messages.h
+++ b/chrome/common/worker_messages.h
@@ -7,6 +7,7 @@
 
 #ifndef CHROME_COMMON_WORKER_MESSAGES_H_
 #define CHROME_COMMON_WORKER_MESSAGES_H_
+#pragma once
 
 #include <string>
 #include <vector>
diff --git a/chrome/common/worker_thread_ticker.h b/chrome/common/worker_thread_ticker.h
index bb39c3b..d392749 100644
--- a/chrome/common/worker_thread_ticker.h
+++ b/chrome/common/worker_thread_ticker.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_WORKER_THREAD_TICKER_H_
 #define CHROME_COMMON_WORKER_THREAD_TICKER_H_
+#pragma once
 
 #include <vector>
 
diff --git a/chrome/common/zip.h b/chrome/common/zip.h
index 2c3d456..1fbb9e3 100644
--- a/chrome/common/zip.h
+++ b/chrome/common/zip.h
@@ -4,6 +4,7 @@
 
 #ifndef CHROME_COMMON_ZIP_H_
 #define CHROME_COMMON_ZIP_H_
+#pragma once
 
 #include <vector>