Delete obsolete cricket::VideoFrame methods.

GetWidth and GetHeight (renamed to width and height),

GetNativeHandle (replaced by video_frame_buffer()->native_handle).

TBR=tkchin@webrtc.org (trivial changes to objc RTCVideoFrame and VideoRendererAdapter)

BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/1990063005
Cr-Commit-Position: refs/heads/master@{#12822}
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm b/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm
index 4976ba9..d810095 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm
+++ b/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm
@@ -32,7 +32,7 @@
     // I420 buffer for rotation before calling the rotation method otherwise
     // it will hit a DCHECK.
     if (nativeVideoFrame.rotation() != webrtc::kVideoRotation_0 &&
-        nativeVideoFrame.GetNativeHandle()) {
+        nativeVideoFrame.video_frame_buffer()->native_handle()) {
       rtc::scoped_refptr<webrtc::VideoFrameBuffer> i420Buffer =
           nativeVideoFrame.video_frame_buffer()->NativeToI420Buffer();
       std::unique_ptr<cricket::VideoFrame> cpuFrame(