Mac: Fix crash when destroying RWHVMacs that use accelerated drawing.

chrome/browser/renderer_host/render_widget_host_view_mac.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 #import <QuartzCore/CALayer.h>
@@ skipping 206 matching lines @@
   virtual void WindowFrameChanged();
   virtual void SetBackground(const SkBitmap& background);
   virtual bool ContainsNativeView(gfx::NativeView native_view) const;
   virtual void UpdateAccessibilityTree(
       const webkit_glue::WebAccessibility& tree);
   // Methods associated with GPU-accelerated plug-in instances and the
   // accelerated compositor.
   virtual gfx::PluginWindowHandle AllocateFakePluginWindowHandle(bool opaque,
                                                                  bool root);
   virtual void DestroyFakePluginWindowHandle(gfx::PluginWindowHandle window);
+
+  // Helper to do the actual cleanup after a plugin handle has been destroyed.
+  // Required because DestroyFakePluginWindowHandle() isn't always called for
+  // all handles (it's e.g. not called on navigation, when the RWHVMac gets
+  // destroyed anyway).
+  void DeallocFakePluginWindowHandle(gfx::PluginWindowHandle window);
+
   virtual void AcceleratedSurfaceSetIOSurface(gfx::PluginWindowHandle window,
                                               int32 width,
                                               int32 height,
                                               uint64 io_surface_identifier);
   virtual void AcceleratedSurfaceSetTransportDIB(
       gfx::PluginWindowHandle window,
       int32 width,
       int32 height,
       TransportDIB::Handle transport_dib);
   virtual void AcceleratedSurfaceBuffersSwapped(gfx::PluginWindowHandle window);
@@ skipping 100 matching lines @@
   // Whether or not web accessibility is enabled.
   bool renderer_accessible_;
 
   // selected text on the renderer.
   std::string selected_text_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_