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

webrtc/modules/desktop_capture/cropping_window_capturer.cc

Index: webrtc/modules/desktop_capture/cropping_window_capturer.cc
diff --git a/webrtc/modules/desktop_capture/cropping_window_capturer.cc b/webrtc/modules/desktop_capture/cropping_window_capturer.cc
index 8f1c772c995b639b64309baa42eba09bc58edb12..d2cc0ae2e81ed77be2aa5f66fc96803747d9554d 100644
--- a/webrtc/modules/desktop_capture/cropping_window_capturer.cc
+++ b/webrtc/modules/desktop_capture/cropping_window_capturer.cc
@@ -106,6 +106,12 @@ DesktopCapturer* CroppingWindowCapturer::Create(
     const DesktopCaptureOptions& options) {
   return DesktopCapturer::CreateWindowCapturer(options).release();
 }
+
+// static
+std::unique_ptr<DesktopCapturer> CroppingWindowCapturer::CreateCapturer(
+    const DesktopCaptureOptions& options) {
+  return DesktopCapturer::CreateWindowCapturer(options);
+}
 #endif
 
 }  // namespace webrtc