Add OVERRIDE to chrome/browser/.

chrome/browser/tabs/tab_strip_model_order_controller.h

Index: chrome/browser/tabs/tab_strip_model_order_controller.h
diff --git a/chrome/browser/tabs/tab_strip_model_order_controller.h b/chrome/browser/tabs/tab_strip_model_order_controller.h
index b62053b044b33abb919e57cf2ef13112d915ccca..d43d7375c24cea4a6eb4e0df5b873d0331cd384c 100644
--- a/chrome/browser/tabs/tab_strip_model_order_controller.h
+++ b/chrome/browser/tabs/tab_strip_model_order_controller.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -46,7 +46,7 @@ class TabStripModelOrderController : public TabStripModelObserver {
   virtual void ActiveTabChanged(TabContentsWrapper* old_contents,
                                 TabContentsWrapper* new_contents,
                                 int index,
-                                bool user_gesture);
+                                bool user_gesture) OVERRIDE;
 
  private:
   // Returns a valid index to be selected after the tab at |removing_index| is