Standardize usage of virtual/override/final specifiers.

content/renderer/media/webrtc/webrtc_video_capturer_adapter_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 <algorithm>
 
 #include "content/renderer/media/webrtc/webrtc_video_capturer_adapter.h"
 #include "media/base/video_frame.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 class WebRtcVideoCapturerAdapterTest
     : public sigslot::has_slots<>,
       public ::testing::Test {
  public:
   WebRtcVideoCapturerAdapterTest()
       : adapter_(false),
         output_frame_width_(0),
         output_frame_height_(0) {
     adapter_.SignalFrameCaptured.connect(
         this, &WebRtcVideoCapturerAdapterTest::OnFrameCaptured);
   }
-  virtual ~WebRtcVideoCapturerAdapterTest() {}
+  ~WebRtcVideoCapturerAdapterTest() override {}
 
   void TestSourceCropFrame(int capture_width,
                            int capture_height,
                            int cropped_width,
                            int cropped_height,
                            int natural_width,
                            int natural_height) {
     const int horiz_crop = ((capture_width - cropped_width) / 2);
     const int vert_crop = ((capture_height - cropped_height) / 2);
 
@@ skipping 27 matching lines @@
 
 TEST_F(WebRtcVideoCapturerAdapterTest, CropFrameTo320320) {
   TestSourceCropFrame(640, 480, 480, 480, 320, 320);
 }
 
 TEST_F(WebRtcVideoCapturerAdapterTest, Scale720To640360) {
   TestSourceCropFrame(1280, 720, 1280, 720, 640, 360);
 }
 
 }  // namespace content