Revert of Delete method cricket::VideoFrame::Copy.

webrtc/media/base/videoframe_unittest.h

Index: webrtc/media/base/videoframe_unittest.h
diff --git a/webrtc/media/base/videoframe_unittest.h b/webrtc/media/base/videoframe_unittest.h
index 38c3f85a71f80523ed003b59480e5f8fc0180b61..39985617c5ae6fcf209e746d3464e241ca9962b3 100644
--- a/webrtc/media/base/videoframe_unittest.h
+++ b/webrtc/media/base/videoframe_unittest.h
@@ -1808,6 +1808,31 @@
     EXPECT_TRUE(IsEqual(frame1, frame2, 1));
   }
 
+  ///////////////////
+  // General tests //
+  ///////////////////
+
+  void Copy() {
+    std::unique_ptr<T> source(new T);
+    std::unique_ptr<cricket::VideoFrame> target;
+    ASSERT_TRUE(LoadFrameNoRepeat(source.get()));
+    target.reset(source->Copy());
+    EXPECT_TRUE(IsEqual(*source, *target, 0));
+    source.reset();
+    ASSERT_TRUE(target->video_frame_buffer() != NULL);
+    EXPECT_TRUE(target->video_frame_buffer()->DataY() != NULL);
+  }
+
+  void CopyIsRef() {
+    std::unique_ptr<T> source(new T);
+    std::unique_ptr<const cricket::VideoFrame> target;
+    ASSERT_TRUE(LoadFrameNoRepeat(source.get()));
+    target.reset(source->Copy());
+    EXPECT_TRUE(IsEqual(*source, *target, 0));
+    const T* const_source = source.get();
+    EXPECT_EQ(const_source->video_frame_buffer(), target->video_frame_buffer());
+  }
+
   int repeat_;
 };