Standardize usage of virtual/override/final specifiers.

content/browser/power_profiler/power_profiler_service_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 "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/power_profiler/power_profiler_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 93 matching lines @@
 
   void RemoveObserverTest() {
      service_->RemoveObserver(&observer_);
 
     // Received |kNumEvents| events.
     EXPECT_EQ(observer_.valid_event_count(), kNumEvents);
   }
 
  protected:
   PowerProfilerServiceTest() : ui_thread_(BrowserThread::UI, &message_loop_) {}
-  virtual ~PowerProfilerServiceTest() {}
+  ~PowerProfilerServiceTest() override {}
 
   void RegisterQuitClosure(base::Closure closure) {
     observer_.set_quit_closure(closure);
   }
 
  private:
   scoped_ptr<PowerProfilerService> service_;
   TestPowerProfilerObserver observer_;
 
   // UI thread.
@@ skipping 11 matching lines @@
 
   ServiceStartTest();
   AddObserverTest();
 
   run_loop.Run();
 
   RemoveObserverTest();
 }
 
 }  // namespace content