content: Remove Lock/Unlock CompositingSurface API from RWH.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index a879a62c1fcbd3131804c215d81416a45a3edf70..400482c89c97783ada0cfc673db3489a360679a4 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -1445,14 +1445,6 @@ gfx::Rect RenderWidgetHostViewMac::GetBoundsInRootWindow() {
   return FlipNSRectToRectScreen(bounds);
 }
 
-void RenderWidgetHostViewMac::LockCompositingSurface() {
-  NOTIMPLEMENTED();
-}
-
-void RenderWidgetHostViewMac::UnlockCompositingSurface() {
-  NOTIMPLEMENTED();
-}
-
 bool RenderWidgetHostViewMac::LockMouse() {
   if (mouse_locked_)
     return true;