Revert of Delete webrtc::VideoFrame::CopyFrame.

webrtc/video/video_quality_test.cc

Index: webrtc/video/video_quality_test.cc
diff --git a/webrtc/video/video_quality_test.cc b/webrtc/video/video_quality_test.cc
index 1102bcb48dffe109c5e18b618ef2582c6a540b13..9adcc162062701fed9263fb06d368aa6f289b69c 100644
--- a/webrtc/video/video_quality_test.cc
+++ b/webrtc/video/video_quality_test.cc
@@ -482,8 +482,8 @@
 
     rtc::CritScope crit(&comparison_lock_);
     if (comparisons_.size() < kMaxComparisons) {
-      reference_copy.ShallowCopy(reference);
-      render_copy.ShallowCopy(render);
+      reference_copy.CopyFrame(reference);
+      render_copy.CopyFrame(render);
     } else {
       // Copy the time to ensure that delay calculations can still be made.
       reference_copy.set_ntp_time_ms(reference.ntp_time_ms());