Standardize usage of virtual/override/final specifiers.

chrome/browser/services/gcm/gcm_account_tracker_unittest.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/services/gcm/gcm_account_tracker.h"
 
 #include <map>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 128 matching lines @@
   update_accounts_called_ = false;
   last_connection_observer_ = NULL;
   removed_connection_observer_ = NULL;
 }
 
 }  // namespace
 
 class GCMAccountTrackerTest : public testing::Test {
  public:
   GCMAccountTrackerTest();
-  virtual ~GCMAccountTrackerTest();
+  ~GCMAccountTrackerTest() override;
 
   // Helpers to pass fake events to the tracker. Tests should have either a pair
   // of Start/FinishAccountSignIn or SignInAccount per account. Don't mix.
   // Call to SignOutAccount is not mandatory.
   void StartAccountSignIn(const std::string& account_key);
   void FinishAccountSignIn(const std::string& account_key);
   void SignInAccount(const std::string& account_key);
   void SignOutAccount(const std::string& account_key);
 
   // Helpers for dealing with OAuth2 access token requests.
@@ skipping 258 matching lines @@
   // clean it up before the SetAccessToken is called. This also means a new
   // token request will be issued
   EXPECT_FALSE(driver()->update_accounts_called());
   EXPECT_EQ(1UL, tracker()->get_pending_token_request_count());
 }
 
 // TODO(fgorski): Add test for adding account after removal >> make sure it does
 // not mark removal.
 
 }  // namespace gcm