Delete ShallowCopy, in favor of copy construction and assignment.

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 ab082d17b97e8b7e16a302ff033a7028436ac249..64cce38b3b815ac9be4dfa614d2cc2930b3379de 100644
--- a/webrtc/video/video_quality_test.cc
+++ b/webrtc/video/video_quality_test.cc
@@ -483,8 +483,8 @@ class VideoAnalyzer : public PacketReceiver,
 
     rtc::CritScope crit(&comparison_lock_);
     if (comparisons_.size() < kMaxComparisons) {
-      reference_copy.ShallowCopy(reference);
-      render_copy.ShallowCopy(render);
+      reference_copy = reference;
+      render_copy = render;
     } else {
       // Copy the time to ensure that delay calculations can still be made.
       reference_copy.set_ntp_time_ms(reference.ntp_time_ms());