Simplify mailbox handling in MailboxOutputSurface

content/renderer/gpu/mailbox_output_surface.h

 // 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.
 
 #ifndef CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
 #define CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
 
 #include <queue>
 
 #include "cc/resources/transferable_resource.h"
@@ skipping 39 matching lines @@
                       const gpu::Mailbox& mailbox,
                       const gfx::Size size)
         : texture_id(texture_id), mailbox(mailbox), size(size), sync_point(0) {}
 
     uint32 texture_id;
     gpu::Mailbox mailbox;
     gfx::Size size;
     uint32 sync_point;
   };
 
-  void ConsumeTexture(const TransferableFrame& frame);
-
   TransferableFrame current_backing_;
   std::deque<TransferableFrame> pending_textures_;
   std::queue<TransferableFrame> returned_textures_;
 
   gfx::Size size_;
   uint32 fbo_;
   bool is_backbuffer_discarded_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_