Enforce marking "override" for functions overriding Blink in components/test_runner/.

components/test_runner/mock_color_chooser.h

 // 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.
 
 #ifndef COMPONENTS_TEST_RUNNER_MOCK_COLOR_CHOOSER_H_
 #define COMPONENTS_TEST_RUNNER_MOCK_COLOR_CHOOSER_H_
 
 #include "base/basictypes.h"
 #include "components/test_runner/web_task.h"
 #include "third_party/WebKit/public/web/WebColorChooser.h"
 #include "third_party/WebKit/public/web/WebColorChooserClient.h"
 
 namespace test_runner {
 
 class WebTestDelegate;
 class WebTestProxyBase;
 
 class MockColorChooser : public blink::WebColorChooser {
 public:
     MockColorChooser(blink::WebColorChooserClient* client,
                      WebTestDelegate* delegate,
                      WebTestProxyBase* proxy);
-    virtual ~MockColorChooser();
+    ~MockColorChooser() override;
 
     // blink::WebColorChooser implementation.
-    virtual void setSelectedColor(const blink::WebColor color) override;
-    virtual void endChooser() override;
+    void setSelectedColor(const blink::WebColor color) override;
+    void endChooser() override;
 
     void InvokeDidEndChooser();
     WebTaskList* mutable_task_list() { return &task_list_; }
 
 private:
     blink::WebColorChooserClient* client_;
     WebTestDelegate* delegate_;
     WebTestProxyBase* proxy_;
     WebTaskList task_list_;
 
     DISALLOW_COPY_AND_ASSIGN(MockColorChooser);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_MOCK_COLOR_CHOOSER_H_