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

webrtc/modules/desktop_capture/cropping_window_capturer_win.cc

Index: webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
diff --git a/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc b/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
index e191d9f3549f22fd96dd3b87ecbbaebc89fc6de8..6ba815fc2947117d813444b25784613d85aeb27e 100644
--- a/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
+++ b/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
@@ -215,4 +215,11 @@ DesktopCapturer* CroppingWindowCapturer::Create(
   return new CroppingWindowCapturerWin(options);
 }
 
+// static
+std::unique_ptr<DesktopCapturer> CroppingWindowCapturer::CreateCapturer(
+    const DesktopCaptureOptions& options) {
+  return std::unique_ptr<DesktopCapturer>(
+      new CroppingWindowCapturerWin(options));
+}
+
 }  // namespace webrtc