cc: Remove unused TextureMailboxDeleter from LayerTreeHostImpl.

cc/trees/layer_tree_host_impl.h

 // Copyright 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 CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <stddef.h>
 
 #include <bitset>
@@ skipping 772 matching lines @@
   bool pinch_gesture_end_should_clear_scrolling_layer_;
 
   std::unique_ptr<TopControlsManager> top_controls_manager_;
 
   std::unique_ptr<PageScaleAnimation> page_scale_animation_;
 
   std::unique_ptr<FrameRateCounter> fps_counter_;
   std::unique_ptr<MemoryHistory> memory_history_;
   std::unique_ptr<DebugRectHistory> debug_rect_history_;
 
-  std::unique_ptr<TextureMailboxDeleter> texture_mailbox_deleter_;
-
   // The maximum memory that would be used by the prioritized resource
   // manager, if there were no limit on memory usage.
   size_t max_memory_needed_bytes_;
 
   // Viewport size passed in from the main thread, in physical pixels.  This
   // value is the default size for all concepts of physical viewport (draw
   // viewport, scrolling viewport and device viewport), but it can be
   // overridden.
   gfx::Size device_viewport_size_;
 
@@ skipping 42 matching lines @@
 
   std::unique_ptr<PendingTreeDurationHistogramTimer>
       pending_tree_duration_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_