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

components/test_runner/mock_web_media_stream_center.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/test_runner/mock_web_media_stream_center.h"
 
 #include "base/logging.h"
 #include "components/test_runner/test_interfaces.h"
 #include "components/test_runner/web_test_delegate.h"
 #include "third_party/WebKit/public/platform/WebAudioDestinationConsumer.h"
@@ skipping 33 matching lines @@
  private:
   blink::WebMediaStream stream_;
 
   DISALLOW_COPY_AND_ASSIGN(NewTrackTask);
 };
 
 class MockWebAudioDestinationConsumer
     : public blink::WebAudioDestinationConsumer {
  public:
   MockWebAudioDestinationConsumer() {}
-  virtual ~MockWebAudioDestinationConsumer() {}
-  virtual void setFormat(size_t number_of_channels, float sample_rate) {}
-  virtual void consumeAudio(const blink::WebVector<const float*>&,
-                            size_t number_of_frames) {}
+  ~MockWebAudioDestinationConsumer() override {}
+  void setFormat(size_t number_of_channels, float sample_rate) override {}
+  void consumeAudio(const blink::WebVector<const float*>&,
+                    size_t number_of_frames) override {}
 
   DISALLOW_COPY_AND_ASSIGN(MockWebAudioDestinationConsumer);
 };
 
 }  // namespace
 
 MockWebMediaStreamCenter::MockWebMediaStreamCenter(
     blink::WebMediaStreamCenterClient* client,
     TestInterfaces* interfaces)
     : interfaces_(interfaces) {
@@ skipping 60 matching lines @@
   interfaces_->GetDelegate()->PostTask(new NewTrackTask(this, stream));
 }
 
 blink::WebAudioSourceProvider*
 MockWebMediaStreamCenter::createWebAudioSourceFromMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   return NULL;
 }
 
 }  // namespace test_runner