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 fc5bade9ac7110b2ba24f712ae33f0fae84e7b7c..b40b7c0ef76bf5648a891394a12979dfb3b96e32 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(),