Remove some dead BrowserPlugin and OOPIF compositing code.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 2c57a2b78d543dafaff3170cf9d2447cc2ce5d62..267f4caa17cc46d19221bfe5af593310374f93ff 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1976,17 +1976,6 @@ bool RenderWidgetHostImpl::GotResponseToLockMouseRequest(bool allowed) {
 }
 
 // static
-void RenderWidgetHostImpl::AcknowledgeBufferPresent(
-    int32 route_id, int gpu_host_id,
-    const AcceleratedSurfaceMsg_BufferPresented_Params& params) {
-  GpuProcessHostUIShim* ui_shim = GpuProcessHostUIShim::FromID(gpu_host_id);
-  if (ui_shim) {
-    ui_shim->Send(new AcceleratedSurfaceMsg_BufferPresented(route_id,
-                                                            params));
-  }
-}
-
-// static
 void RenderWidgetHostImpl::SendSwapCompositorFrameAck(
     int32 route_id,
     uint32 output_surface_id,