Add OVERRIDE to base/.

base/threading/thread.h

 // 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.
 
 #ifndef BASE_THREAD_H_
 #define BASE_THREAD_H_
 #pragma once
 
 #include <string>
 
@@ skipping 138 matching lines @@
   static bool GetThreadWasQuitProperly();
 
   void set_message_loop(MessageLoop* message_loop) {
     message_loop_ = message_loop;
   }
 
  private:
   bool thread_was_started() const { return started_; }
 
   // PlatformThread::Delegate methods:
-  virtual void ThreadMain();
+  virtual void ThreadMain() OVERRIDE;
 
   // Whether we successfully started the thread.
   bool started_;
 
   // If true, we're in the middle of stopping, and shouldn't access
   // |message_loop_|. It may non-NULL and invalid.
   bool stopping_;
 
   // Used to pass data to ThreadMain.
   struct StartupData;
@@ skipping 13 matching lines @@
   std::string name_;
 
   friend class ThreadQuitTask;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 }  // namespace base
 
 #endif  // BASE_THREAD_H_