Add the "virtual" keyword on method overrides that are missing it.

chrome/browser/speech/speech_recognition_request.h

 // Copyright (c) 2010 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 CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_
 #define CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_
 
 #include <string>
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
@@ skipping 35 matching lines @@
   // previous request has completed.
   bool Send(const std::string& language,
             const std::string& grammar,
             const std::string& hardware_info,
             const std::string& content_type,
             const std::string& audio_data);
 
   bool HasPendingRequest() { return url_fetcher_ != NULL; }
 
   // URLFetcher::Delegate methods.
-  void OnURLFetchComplete(const URLFetcher* source,
-                          const GURL& url,
-                          const URLRequestStatus& status,
-                          int response_code,
-                          const ResponseCookies& cookies,
-                          const std::string& data);
+  virtual void OnURLFetchComplete(const URLFetcher* source,
+                                  const GURL& url,
+                                  const URLRequestStatus& status,
+                                  int response_code,
+                                  const ResponseCookies& cookies,
+                                  const std::string& data);
 
  private:
   scoped_refptr<URLRequestContextGetter> url_context_;
   Delegate* delegate_;
   scoped_ptr<URLFetcher> url_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionRequest);
 };
 
 // This typedef is to workaround the issue with certain versions of
 // Visual Studio where it gets confused between multiple Delegate
 // classes and gives a C2500 error. (I saw this error on the try bots -
 // the workaround was not needed for my machine).
 typedef SpeechRecognitionRequest::Delegate SpeechRecognitionRequestDelegate;
 
 }  // namespace speech_input
 
 #endif  // CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_