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

chrome/common/net/gaia/gaia_auth_fetcher.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_COMMON_NET_GAIA_GAIA_AUTH_FETCHER_H_
 #define CHROME_COMMON_NET_GAIA_GAIA_AUTH_FETCHER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 56 matching lines @@
                            const char* const service);
 
   // Start a request to get a particular key from user info.
   // GaiaAuthConsumer will be called back on the same thread when
   // results come back.
   // You can't make more than one request at a time.
   void StartGetUserInfo(const std::string& lsid,
                         const std::string& info_key);
 
   // Implementation of URLFetcher::Delegate
-  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);
 
   // StartClientLogin been called && results not back yet?
   bool HasPendingFetch();
 
   // Stop any URL fetches in progress.
   void CancelRequest();
 
  private:
   // ClientLogin body constants that don't change
   static const char kCookiePersistence[];
@@ skipping 104 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(GaiaAuthFetcherTest, IncomprehensibleError);
   FRIEND_TEST_ALL_PREFIXES(GaiaAuthFetcherTest, ServiceUnavailableError);
   FRIEND_TEST_ALL_PREFIXES(GaiaAuthFetcherTest, CheckNormalErrorCode);
   FRIEND_TEST_ALL_PREFIXES(GaiaAuthFetcherTest, CheckTwoFactorResponse);
   FRIEND_TEST_ALL_PREFIXES(GaiaAuthFetcherTest, LoginNetFailure);
 
   DISALLOW_COPY_AND_ASSIGN(GaiaAuthFetcher);
 };
 
 #endif  // CHROME_COMMON_NET_GAIA_GAIA_AUTH_FETCHER_H_