Use std::unique_ptr<> to pass frame ownership in DesktopCapturer impls.

webrtc/modules/desktop_capture/screen_capture_frame_queue.h

 /*
  *  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 31 matching lines @@
   ~ScreenCaptureFrameQueue() = default;
 
   // Moves to the next frame in the queue, moving the 'current' frame to become
   // the 'previous' one.
   void MoveToNextFrame() {
     current_ = (current_ + 1) % kQueueLength;
   }
 
   // Replaces the current frame with a new one allocated by the caller. The
   // existing frame (if any) is destroyed. Takes ownership of |frame|.
-  void ReplaceCurrentFrame(FrameType* frame) {
-    frames_[current_].reset(frame);
+  void ReplaceCurrentFrame(std::unique_ptr<FrameType> frame) {
+    frames_[current_] = std::move(frame);
   }
 
   // Marks all frames obsolete and resets the previous frame pointer. No
   // frames are freed though as the caller can still access them.
   void Reset() {
     for (int i = 0; i < kQueueLength; i++) {
       frames_[i].reset();
     }
     current_ = 0;
   }
@@ skipping 12 matching lines @@
 
   static const int kQueueLength = 2;
   std::unique_ptr<FrameType> frames_[kQueueLength];
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCaptureFrameQueue);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_SCREEN_CAPTURE_FRAME_QUEUE_H_