Add OVERRIDE to chrome/browser/ui/gtk/.

chrome/browser/ui/gtk/back_forward_button_gtk.h

Index: chrome/browser/ui/gtk/back_forward_button_gtk.h
diff --git a/chrome/browser/ui/gtk/back_forward_button_gtk.h b/chrome/browser/ui/gtk/back_forward_button_gtk.h
index 2b518bad25ee23e9cc2292bf910ba19c0b9e66d2..d09a71fb7572479d20de770300bbd61446977017 100644
--- a/chrome/browser/ui/gtk/back_forward_button_gtk.h
+++ b/chrome/browser/ui/gtk/back_forward_button_gtk.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_UI_GTK_BACK_FORWARD_BUTTON_GTK_H_
 #pragma once
 
+#include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/task.h"
@@ -26,8 +27,8 @@ class BackForwardButtonGtk : MenuGtk::Delegate {
   virtual ~BackForwardButtonGtk();
 
   // MenuGtk::Delegate implementation.
-  virtual void StoppedShowing();
-  virtual bool AlwaysShowIconForCmd(int command_id) const;
+  virtual void StoppedShowing() OVERRIDE;
+  virtual bool AlwaysShowIconForCmd(int command_id) const OVERRIDE;
 
   GtkWidget* widget() { return button_->widget(); }