Mac: Clean up visibility state tracking

content/browser/renderer_host/render_widget_host_view_aura.cc

 // 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_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 2879 matching lines @@
   RenderViewHostDelegate* delegate = rvh->GetDelegate();
   if (!delegate)
     return nullptr;
 
   return delegate->GetDelegateView();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DelegatedFrameHost, public:
 
-int RenderWidgetHostViewAura::DelegatedFrameHostGetGpuMemoryBufferClientId()
-    const {
-  return host_->GetProcess()->GetID();
-}
 ui::Layer* RenderWidgetHostViewAura::DelegatedFrameHostGetLayer() const {
   return window_->layer();
 }
 
 bool RenderWidgetHostViewAura::DelegatedFrameHostIsVisible() const {
   return !host_->is_hidden();
 }
 
 SkColor RenderWidgetHostViewAura::DelegatedFrameHostGetGutterColor(
     SkColor color) const {
@@ skipping 123 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content