Delete ShallowCopy, in favor of copy construction and assignment.

webrtc/modules/video_processing/test/video_processing_unittest.cc

Index: webrtc/modules/video_processing/test/video_processing_unittest.cc
diff --git a/webrtc/modules/video_processing/test/video_processing_unittest.cc b/webrtc/modules/video_processing/test/video_processing_unittest.cc
index 259829ad8f8339c5f5cb8174559c5fa884bcbb80..f5cd9cab514a201e3790fbac6403dc5620259f5e 100644
--- a/webrtc/modules/video_processing/test/video_processing_unittest.cc
+++ b/webrtc/modules/video_processing/test/video_processing_unittest.cc
@@ -249,8 +249,7 @@ void TestSize(const VideoFrame& source_frame,
   WriteProcessedFrameForVisualInspection(source_frame, *out_frame);
 
   // Scale |resampled_source_frame| back to the source scale.
-  VideoFrame resampled_source_frame;
-  resampled_source_frame.ShallowCopy(*out_frame);
+  VideoFrame resampled_source_frame(*out_frame);
   // Compute PSNR against the cropped source frame and check expectation.
   PreprocessFrameAndVerify(resampled_source_frame,
                            cropped_source.width(),