content: Remove Lock/Unlock CompositingSurface API from RWH.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 68311d6fcbe66000359f4e97f1284f2c9151b386..6317139b1298d85641a1fd26406a6b9b4510287e 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -2274,14 +2274,6 @@ void RenderWidgetHostViewAura::OnDidNavigateMainFrameToNewPage() {
   ui::GestureRecognizer::Get()->CancelActiveTouches(window_);
 }
 
-void RenderWidgetHostViewAura::LockCompositingSurface() {
-  NOTIMPLEMENTED();
-}
-
-void RenderWidgetHostViewAura::UnlockCompositingSurface() {
-  NOTIMPLEMENTED();
-}
-
 cc::FrameSinkId RenderWidgetHostViewAura::GetFrameSinkId() {
   return delegated_frame_host_ ? delegated_frame_host_->GetFrameSinkId()
                                : cc::FrameSinkId();