Add OVERRIDE to chrome/browser/chromeos/.

chrome/browser/chromeos/views/dropdown_button.h

Index: chrome/browser/chromeos/views/dropdown_button.h
diff --git a/chrome/browser/chromeos/views/dropdown_button.h b/chrome/browser/chromeos/views/dropdown_button.h
index ab33addbeb42664cf3baf0cd0bb61857ed8025b6..eeac578ba51f33284a6047df14738a76adfd045d 100644
--- a/chrome/browser/chromeos/views/dropdown_button.h
+++ b/chrome/browser/chromeos/views/dropdown_button.h
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "views/controls/button/menu_button.h"
 
 namespace chromeos {
@@ -22,12 +23,12 @@ class DropDownButton : public views::MenuButton {
                  bool show_menu_marker);
   virtual ~DropDownButton();
 
-  virtual void OnPaintFocusBorder(gfx::Canvas* canvas);
+  virtual void OnPaintFocusBorder(gfx::Canvas* canvas) OVERRIDE;
 
   // Override SetText to set the accessible value, rather than the
   // accessible name, since this acts more like a combo box than a
   // menu.
-  virtual void SetText(const string16& text);
+  virtual void SetText(const string16& text) OVERRIDE;
 
   virtual string16 GetAccessibleValue();