Revert of Delete deprecated and transitional stuff related to video frame refactoring.

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

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 142 matching lines @@
   rtc::scoped_refptr<VideoFrameBuffer> buffer =
       new rtc::RefCountedObject<CoreVideoFrameBuffer>(
           image_buffer,
           adapted_width, adapted_height,
           crop_width, crop_height,
           crop_x, crop_y);
 
   // Applying rotation is only supported for legacy reasons and performance is
   // not critical here.
   if (apply_rotation() && rotation != kVideoRotation_0) {
-    buffer = I420Buffer::Rotate(*buffer->NativeToI420Buffer(),
+    buffer = I420Buffer::Rotate(buffer->NativeToI420Buffer(),
                                 rotation);
     if (rotation == kVideoRotation_90 || rotation == kVideoRotation_270) {
       std::swap(captured_width, captured_height);
     }
 
     rotation = kVideoRotation_0;
   }
 
   OnFrame(webrtc::VideoFrame(buffer, rotation, translated_camera_time_us),
           captured_width, captured_height);
 }
 
 }  // namespace webrtc