Deletes the class VideoRendererCallback.

webrtc/modules/video_render/ios/video_render_ios_impl.mm

 /*
  *  Copyright (c) 2013 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 42 matching lines @@
   CriticalSectionScoped cs(crit_sec_);
   if (window == NULL) {
     return -1;
   }
 
   ptr_window_ = window;
 
   return ptr_ios_render_->ChangeWindow(ptr_window_);
 }
 
-VideoRenderCallback* VideoRenderIosImpl::AddIncomingRenderStream(
-    const uint32_t stream_id,
-    const uint32_t z_order,
-    const float left,
-    const float top,
-    const float right,
-    const float bottom) {
+rtc::VideoSinkInterface<VideoFrame>*
+VideoRenderIosImpl::AddIncomingRenderStream(const uint32_t stream_id,
+                                            const uint32_t z_order,
+                                            const float left,
+                                            const float top,
+                                            const float right,
+                                            const float bottom) {
   CriticalSectionScoped cs(crit_sec_);
   if (!ptr_window_) {
     return NULL;
   }
 
   return ptr_ios_render_->CreateEaglChannel(
       stream_id, z_order, left, top, right, bottom);
 }
 
 int32_t VideoRenderIosImpl::DeleteIncomingRenderStream(
@@ skipping 81 matching lines @@
                                       const float left,
                                       const float top,
                                       const float right,
                                       const float bottom) {
   IOS_UNSUPPORTED();
 }
 
 int32_t VideoRenderIosImpl::FullScreenRender(void* window, const bool enable) {
   IOS_UNSUPPORTED();
 }