CroppingWindowCapturer::CreateCapturer() function to replace raw pointer version

webrtc/modules/desktop_capture/cropping_window_capturer_win.cc

 /*
  *  Copyright (c) 2014 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 197 matching lines @@
 }
 
 }  // namespace
 
 // static
 DesktopCapturer* CroppingWindowCapturer::Create(
     const DesktopCaptureOptions& options) {
   return new CroppingWindowCapturerWin(options);
 }
 
+// static
+std::unique_ptr<DesktopCapturer> CroppingWindowCapturer::CreateCapturer(
+    const DesktopCaptureOptions& options) {
+  return std::unique_ptr<DesktopCapturer>(
+      new CroppingWindowCapturerWin(options));
+}
+
 }  // namespace webrtc