Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extension_debugger_api.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.
 
 // Defines the Chrome Extensions Debugger API functions for attaching debugger
 // to the page.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_DEBUGGER_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DEBUGGER_API_H_
 #pragma once
@@ skipping 22 matching lines @@
   TabContents* contents_;
   int tab_id_;
   ExtensionDevToolsClientHost* client_host_;
 };
 
 // Implements the debugger.attach() extension function.
 class AttachDebuggerFunction : public DebuggerFunction {
  public:
   AttachDebuggerFunction();
   virtual ~AttachDebuggerFunction();
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.attach")
 };
 
 // Implements the debugger.detach() extension function.
 class DetachDebuggerFunction : public DebuggerFunction {
  public:
   DetachDebuggerFunction();
   virtual ~DetachDebuggerFunction();
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.detach")
 };
 
 // Implements the debugger.sendCommand() extension function.
 class SendCommandDebuggerFunction : public DebuggerFunction {
  public:
   SendCommandDebuggerFunction();
   virtual ~SendCommandDebuggerFunction();
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
 
   void SendResponseBody(base::DictionaryValue* dictionary);
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.sendCommand")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DEBUGGER_API_H_