Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/api/idle/idle_api_unittest.cc

 // Copyright (c) 2012 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/extensions/api/idle/idle_api.h"
 
 #include <limits.h>
 #include <string>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 24 matching lines @@
   MockEventDelegate() {}
   virtual ~MockEventDelegate() {}
   MOCK_METHOD2(OnStateChanged, void(const std::string&, IdleState));
   virtual void RegisterObserver(EventRouter::Observer* observer) {}
   virtual void UnregisterObserver(EventRouter::Observer* observer) {}
 };
 
 class TestIdleProvider : public IdleManager::IdleTimeProvider {
  public:
   TestIdleProvider();
-  virtual ~TestIdleProvider();
-  virtual void CalculateIdleState(int idle_threshold,
-                                  IdleCallback notify) override;
-  virtual void CalculateIdleTime(IdleTimeCallback notify) override;
-  virtual bool CheckIdleStateIsLocked() override;
+  ~TestIdleProvider() override;
+  void CalculateIdleState(int idle_threshold, IdleCallback notify) override;
+  void CalculateIdleTime(IdleTimeCallback notify) override;
+  bool CheckIdleStateIsLocked() override;
 
   void set_idle_time(int idle_time);
   void set_locked(bool locked);
 
  private:
   int idle_time_;
   bool locked_;
 };
 
 TestIdleProvider::TestIdleProvider()
@@ skipping 500 matching lines @@
 
   {
     // Nothing should have fired, the listener wasn't added until afterward.
     ScopedListen listen(idle_manager_, "test");
     idle_manager_->UpdateIdleState();
     testing::Mock::VerifyAndClearExpectations(event_delegate_);
   }
 }
 
 }  // namespace extensions