Enable clang style plugin in webrtc/modules/desktop_capture

webrtc/modules/desktop_capture/screen_capturer_mac.mm

 /*
  *  Copyright (c) 2013 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.
  */
 
@@ skipping 261 matching lines @@
 
   return CGWindowListCreateImageFromArray(
       window_bounds, window_list, kCGWindowImageDefault);
 }
 
 // A class to perform video frame capturing for mac.
 class ScreenCapturerMac : public ScreenCapturer {
  public:
   explicit ScreenCapturerMac(
       rtc::scoped_refptr<DesktopConfigurationMonitor> desktop_config_monitor);
-  virtual ~ScreenCapturerMac();
+  ~ScreenCapturerMac() override;
 
   bool Init();
 
   // Overridden from ScreenCapturer:
   void Start(Callback* callback) override;
   void CaptureFrame() override;
   void SetExcludedWindow(WindowId window) override;
   bool GetScreenList(ScreenList* screens) override;
   bool SelectScreen(ScreenId id) override;
 
@@ skipping 74 matching lines @@
       : DesktopFrame(
             frame->size(),
             -frame->stride(),
             frame->data() + (frame->size().height() - 1) * frame->stride(),
             frame->shared_memory()) {
     original_frame_ = std::move(frame);
     set_dpi(original_frame_->dpi());
     set_capture_time_ms(original_frame_->capture_time_ms());
     mutable_updated_region()->Swap(original_frame_->mutable_updated_region());
   }
-  virtual ~InvertedDesktopFrame() {}
+  ~InvertedDesktopFrame() override {}
 
  private:
   std::unique_ptr<DesktopFrame> original_frame_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(InvertedDesktopFrame);
 };
 
 ScreenCapturerMac::ScreenCapturerMac(
     rtc::scoped_refptr<DesktopConfigurationMonitor> desktop_config_monitor)
     : desktop_config_monitor_(desktop_config_monitor) {
@@ skipping 643 matching lines @@
   }
 
   if (options.detect_updated_region()) {
     capturer.reset(new ScreenCapturerDifferWrapper(std::move(capturer)));
   }
 
   return capturer.release();
 }
 
 }  // namespace webrtc