Add gfx::kNullCursor to refer to "no cursor"

linux/aura build uses unsigned long as NativeCursor which requires
cast to use NULL. Define constants instead.

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/8216016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@104848 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 4 insertions, 3 deletions

diff --git a/views/widget/native_widget_aura.cc b/views/widget/native_widget_aura.cc
index d910843..b261571 100644
--- a/views/widget/native_widget_aura.cc
+++ b/views/widget/native_widget_aura.cc
@@ -63,7 +63,7 @@ NativeWidgetAura::NativeWidgetAura(internal::NativeWidgetDelegate* delegate)
       ownership_(Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET),
       ALLOW_THIS_IN_INITIALIZER_LIST(close_widget_factory_(this)),
       can_activate_(true),
-      cursor_(NULL) {
+      cursor_(gfx::kNullCursor) {
 }
 
 NativeWidgetAura::~NativeWidgetAura() {
diff --git a/views/widget/native_widget_view.cc b/views/widget/native_widget_view.cc
index d9d6289..98b8bd5 100644
--- a/views/widget/native_widget_view.cc
+++ b/views/widget/native_widget_view.cc
@@ -6,6 +6,7 @@
 
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/compositor/layer.h"
+#include "ui/gfx/native_widget_types.h"
 
 namespace views {
 namespace internal {
@@ -20,7 +21,7 @@ NativeWidgetView::NativeWidgetView(NativeWidgetViews* native_widget)
     : native_widget_(native_widget),
       sent_create_(false),
       delete_native_widget_(true),
-      cursor_(NULL) {
+      cursor_(gfx::kNullCursor) {
 }
 
 NativeWidgetView::~NativeWidgetView() {
diff --git a/views/widget/root_view.cc b/views/widget/root_view.cc
index 1d60945..8c0de57 100644
--- a/views/widget/root_view.cc
+++ b/views/widget/root_view.cc
@@ -306,7 +306,7 @@ void RootView::OnMouseMoved(const MouseEvent& event) {
       widget_->SetCursor(mouse_move_handler_->GetCursor(moved_event));
   } else if (mouse_move_handler_ != NULL) {
     mouse_move_handler_->OnMouseExited(e);
-    widget_->SetCursor(NULL);
+    widget_->SetCursor(gfx::kNullCursor);
   }
 }