Cleanup ServerWindowCompositorFrameSinkManager and FrameGenerator

services/ui/ws/server_window_compositor_frame_sink_manager.cc

Index: services/ui/ws/server_window_compositor_frame_sink_manager.cc
diff --git a/services/ui/ws/server_window_compositor_frame_sink_manager.cc b/services/ui/ws/server_window_compositor_frame_sink_manager.cc
index 5b2da17c1fa55c916367962e5def386b9bed5788..29cd7e99873e35f723636498ef1d442c3f5554fa 100644
--- a/services/ui/ws/server_window_compositor_frame_sink_manager.cc
+++ b/services/ui/ws/server_window_compositor_frame_sink_manager.cc
@@ -109,10 +109,6 @@ void ServerWindowCompositorFrameSinkManager::RemoveChildFrameSinkId(
   frame_sink_data_->compositor_frame_sink->RemoveChildFrameSink(frame_sink_id);
 }
 
-bool ServerWindowCompositorFrameSinkManager::HasCompositorFrameSink() const {
-  return !!frame_sink_data_;
-}
-
 gfx::Size ServerWindowCompositorFrameSinkManager::GetLatestFrameSize() const {
   if (!frame_sink_data_)
     return gfx::Size();
@@ -120,14 +116,6 @@ gfx::Size ServerWindowCompositorFrameSinkManager::GetLatestFrameSize() const {
   return frame_sink_data_->latest_submitted_surface_info.size_in_pixels();
 }
 
-cc::SurfaceId ServerWindowCompositorFrameSinkManager::GetLatestSurfaceId()
-    const {
-  if (!frame_sink_data_)
-    return cc::SurfaceId();
-
-  return frame_sink_data_->latest_submitted_surface_info.id();
-}
-
 void ServerWindowCompositorFrameSinkManager::SetLatestSurfaceInfo(
     const cc::SurfaceInfo& surface_info) {
   if (!frame_sink_data_)