Remove unused fields from //content.

content/renderer/child_frame_compositing_helper.h

 // Copyright 2014 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 CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_
 #define CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 94 matching lines @@
                               cc::SurfaceSequence sequence);
   static void RequireCallbackBrowserPlugin(
       scoped_refptr<ThreadSafeSender> sender,
       int host_routing_id,
       int browser_plugin_instance_id,
       cc::SurfaceId id,
       cc::SurfaceSequence sequence);
   void UpdateWebLayer(blink::WebLayer* layer);
 
   int host_routing_id_;
-  bool opaque_;
 
   gfx::Size buffer_size_;
 
   // The lifetime of this weak pointer should be greater than the lifetime of
   // other member objects, as they may access this pointer during their
   // destruction.
   base::WeakPtr<BrowserPlugin> browser_plugin_;
   RenderFrameProxy* render_frame_proxy_;
 
   std::unique_ptr<blink::WebLayer> web_layer_;
   cc::SurfaceId surface_id_;
   blink::WebFrame* frame_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildFrameCompositingHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_