Deletes the class VideoRendererCallback.

webrtc/modules/video_render/ios/video_render_ios_impl.mm

Index: webrtc/modules/video_render/ios/video_render_ios_impl.mm
diff --git a/webrtc/modules/video_render/ios/video_render_ios_impl.mm b/webrtc/modules/video_render/ios/video_render_ios_impl.mm
index 0ef411d56f80adc1602a7c1965f4144eb3c5134f..92f0a6e9a4e83e77ae83ccaed07ce2fa3d18333b 100644
--- a/webrtc/modules/video_render/ios/video_render_ios_impl.mm
+++ b/webrtc/modules/video_render/ios/video_render_ios_impl.mm
@@ -60,13 +60,13 @@ int32_t VideoRenderIosImpl::ChangeWindow(void* 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;