Remove webrtc::DesktopCapturer::Callback::CreateSharedMemory() overrides.

remoting/protocol/video_frame_pump.cc

Index: remoting/protocol/video_frame_pump.cc
diff --git a/remoting/protocol/video_frame_pump.cc b/remoting/protocol/video_frame_pump.cc
index 796e9d7575c95f0e7a15bb341bc811bcf6be2c9b..ab98abcc84048ea4d6d056e6fb4160bc965ab7c3 100644
--- a/remoting/protocol/video_frame_pump.cc
+++ b/remoting/protocol/video_frame_pump.cc
@@ -112,11 +112,6 @@ void VideoFramePump::SetSizeCallback(const SizeCallback& size_callback) {
   size_callback_ = size_callback;
 }
 
-webrtc::SharedMemory* VideoFramePump::CreateSharedMemory(size_t size) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  return nullptr;
-}
-
 void VideoFramePump::OnCaptureCompleted(webrtc::DesktopFrame* frame) {
   DCHECK(thread_checker_.CalledOnValidThread());