Fix the mac hangup when force-compositing-mode is enabled

chrome/browser/renderer_host/accelerated_plugin_view_mac.h

 // Copyright (c) 2011 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_ACCELERATED_PLUGIN_VIEW_MAC_H
 #define CHROME_BROWSER_RENDERER_HOST_ACCELERATED_PLUGIN_VIEW_MAC_H
 
 #import <Cocoa/Cocoa.h>
 #include <QuartzCore/QuartzCore.h>
 
@@ skipping 22 matching lines @@
 //
 // No code should ever try to acquire a lock further up in the hierarchy if it
 // already owns a lower lock. For example, while the CGL lock is taken, no
 // CVDisplayLink* functions must be called.
 @interface AcceleratedPluginView : NSView {
   scoped_nsobject<NSOpenGLPixelFormat> glPixelFormat_;
   CGLPixelFormatObj cglPixelFormat_;  // weak, backed by |glPixelFormat_|.
   scoped_nsobject<NSOpenGLContext> glContext_;
   CGLContextObj cglContext_;  // weak, backed by |glContext_|.
 
-  CVDisplayLinkRef displayLink_;  // Owned by us.
+//CVDisplayLinkRef displayLink_;  // Owned by us.
 
   RenderWidgetHostViewMac* renderWidgetHostView_;  // weak
   gfx::PluginWindowHandle pluginHandle_;  // weak
 
   // The number of swap buffers calls that have been requested by the
   // GPU process, or a monotonically increasing number of calls to
   // updateSwapBuffersCount:fromRenderer:routeId: if the update came
   // from an accelerated plugin.
   uint64 swapBuffersCount_;
   // The number of swap buffers calls that have been processed by the
@@ skipping 44 matching lines @@
 // RHWVCocoa gets dealloc'd, which means the AcceleratedPluginView child views
 // can be around a little longer than the RWHVMac. This is called when the
 // RWHVMac is about to be deleted (but it's still valid while this method runs).
 - (void)onRenderWidgetHostViewGone;
 
 // This _must_ be atomic, since it's accessed from several threads.
 @property NSSize cachedSize;
 @end
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_ACCELERATED_PLUGIN_VIEW_MAC_H