Standardize usage of virtual/override/final specifiers.

components/gcm_driver/gcm_delayed_task_controller_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 "components/gcm_driver/gcm_delayed_task_controller.h"
 
 #include "base/bind.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gcm {
 
 class GCMDelayedTaskControllerTest : public testing::Test {
  public:
   GCMDelayedTaskControllerTest();
-  virtual ~GCMDelayedTaskControllerTest();
+  ~GCMDelayedTaskControllerTest() override;
 
   void TestTask();
 
   GCMDelayedTaskController* controller() { return controller_.get(); }
 
   int number_of_triggered_tasks() const { return number_of_triggered_tasks_; }
 
  private:
   scoped_ptr<GCMDelayedTaskController> controller_;
   int number_of_triggered_tasks_;
@@ skipping 26 matching lines @@
   controller()->AddTask(base::Bind(&GCMDelayedTaskControllerTest::TestTask,
                                    base::Unretained(this)));
   controller()->AddTask(base::Bind(&GCMDelayedTaskControllerTest::TestTask,
                                    base::Unretained(this)));
 
   controller()->SetReady();
   EXPECT_EQ(2, number_of_triggered_tasks());
 }
 
 }  // namespace gcm