Remove more GpuMemoryBufferId plumbing

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 387 matching lines @@
   return results;
 }
 
 }  // namespace
 
 namespace content {
 
 ////////////////////////////////////////////////////////////////////////////////
 // DelegatedFrameHost, public:
 
-int RenderWidgetHostViewMac::DelegatedFrameHostGetGpuMemoryBufferClientId()
-    const {
-  return render_widget_host_->GetProcess()->GetID();
-}
-
 ui::Layer* RenderWidgetHostViewMac::DelegatedFrameHostGetLayer() const {
   return browser_compositor_->GetRootLayer();
 }
 
 bool RenderWidgetHostViewMac::DelegatedFrameHostIsVisible() const {
   return !render_widget_host_->is_hidden();
 }
 
 SkColor RenderWidgetHostViewMac::DelegatedFrameHostGetGutterColor(
     SkColor color) const {
@@ skipping 2884 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end