Enable clang style plugin in webrtc/modules/desktop_capture

webrtc/modules/desktop_capture/win/dxgi_texture.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/modules/desktop_capture/win/dxgi_texture.h"
 
 #include "webrtc/modules/desktop_capture/desktop_region.h"
 
 namespace webrtc {
 
 namespace {
 
 class DxgiDesktopFrame : public DesktopFrame {
  public:
   explicit DxgiDesktopFrame(const DxgiTexture& texture)
       : DesktopFrame(texture.desktop_rect().size(),
                      texture.pitch(),
                      texture.bits(),
                      nullptr) {}
 
-  virtual ~DxgiDesktopFrame() = default;
+  ~DxgiDesktopFrame() override = default;
 };
 
 }  // namespace
 
 DxgiTexture::DxgiTexture(const DesktopRect& desktop_rect)
     : desktop_rect_(desktop_rect) {}
 
 const DesktopFrame& DxgiTexture::AsDesktopFrame() {
   if (!frame_) {
     frame_.reset(new DxgiDesktopFrame(*this));
   }
   return *frame_;
 }
 
 bool DxgiTexture::Release() {
   frame_.reset();
   return DoRelease();
 }
 
 }  // namespace webrtc