Clean up RTCVideoFrame

webrtc/sdk/objc/Framework/Classes/RTCOpenGLVideoRenderer.mm

Index: webrtc/sdk/objc/Framework/Classes/RTCOpenGLVideoRenderer.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCOpenGLVideoRenderer.mm b/webrtc/sdk/objc/Framework/Classes/RTCOpenGLVideoRenderer.mm
index aaf7e7129627d82819b7012ed115aebc99db008f..bfd6eebe7ebe70077d92dfe23f2111a1346aa021 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCOpenGLVideoRenderer.mm
+++ b/webrtc/sdk/objc/Framework/Classes/RTCOpenGLVideoRenderer.mm
@@ -48,16 +48,20 @@
       _nv12Shader = [[RTCNativeNV12Shader alloc] initWithContext:_context];
     }
     shader = _nv12Shader;
-#else
-  // Rendering native CVPixelBuffer is not supported on OS X.
-  if (false) {
-#endif
   } else {
     if (!_i420Shader) {
       _i420Shader = [[RTCI420Shader alloc] initWithContext:_context];
     }
     shader = _i420Shader;
   }
+#else
+  // Rendering native CVPixelBuffer is not supported on OS X.
+  frame = [frame newI420VideoFrame];
+  if (!_i420Shader) {
+    _i420Shader = [[RTCI420Shader alloc] initWithContext:_context];
+  }
+  shader = _i420Shader;
+#endif
   if (!shader || ![shader drawFrame:frame]) {
     return NO;
   }