Reland of Delete method cricket::VideoFrame::Copy. (patchset #1 id:1 of https://codereview.webrtc.org/2087923004/ )

Reason for revert:
Downstream issue now fixed.

Original issue's description:
> Revert of Delete method cricket::VideoFrame::Copy. (patchset #7 id:120001 of https://codereview.webrtc.org/2080253002/ )
>
> Reason for revert:
> It broke a downstream build by removing VideoFrame::Copy method.
>
> Original issue's description:
> > Delete method cricket::VideoFrame::Copy.
> >
> > Should be unused in Chrome since cl
> > https://codereview.chromium.org/2068703002/
> >
> > TBR=tkchin@webrtc.org,magjed@webrtc.org
> > BUG=webrtc:5682
> >
> > Committed: https://crrev.com/9c00f646f0b3cd33506a1944c7bc6724af041237
> > Committed: https://crrev.com/7e4e00d189a5dfac2b463a5100ee65ee2f11ed79
> > Cr-Original-Commit-Position: refs/heads/master@{#13236}
> > Cr-Commit-Position: refs/heads/master@{#13244}
>
> TBR=pbos@webrtc.org,tkchin@webrtc.org,magjed@webrtc.org,sergeyu@chromium.org,nisse@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:5682
>
> Committed: https://crrev.com/123f33cd009606d22cca8b0f4756812406d4580f
> Cr-Commit-Position: refs/heads/master@{#13246}

TBR=pbos@webrtc.org,tkchin@webrtc.org,magjed@webrtc.org,sergeyu@chromium.org,honghaiz@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/2275243002
Cr-Original-Commit-Position: refs/heads/master@{#13924}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: f715f983f1b33208ab2d2434f8b36ad5271f680f
diff --git a/app/webrtc/objc/RTCI420Frame.mm b/app/webrtc/objc/RTCI420Frame.mm
index 6c6c564..1646510 100644
--- a/app/webrtc/objc/RTCI420Frame.mm
+++ b/app/webrtc/objc/RTCI420Frame.mm
@@ -29,7 +29,7 @@
 
 #include <memory>
 
-#include "webrtc/media/base/videoframe.h"
+#include "webrtc/media/engine/webrtcvideoframe.h"
 
 @implementation RTCI420Frame {
   std::unique_ptr<cricket::VideoFrame> _videoFrame;
@@ -98,7 +98,10 @@
   if (self = [super init]) {
     // Keep a shallow copy of the video frame. The underlying frame buffer is
     // not copied.
-    _videoFrame.reset(videoFrame->Copy());
+    _videoFrame.reset(new cricket::WebRtcVideoFrame(
+        videoFrame->video_frame_buffer(),
+        videoFrame->rotation(),
+        videoFrame->timestamp_us()));
   }
   return self;
 }