Fix "unused variable" warnings.

content/browser/renderer_host/render_widget_host_view_android.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 309 matching lines @@
   void StopObservingRootWindow();
   void SendBeginFrame(base::TimeTicks frame_time, base::TimeDelta vsync_period);
   bool Animate(base::TimeTicks frame_time);
   void RequestDisallowInterceptTouchEvent();
 
   bool SyncCompositorOnMessageReceived(const IPC::Message& message);
 
   // The model object.
   RenderWidgetHostImpl* host_;
 
-  bool use_surfaces_;
-
   // Used to control action dispatch at the next |OnVSync()| call.
   uint32_t outstanding_vsync_requests_;
 
   bool is_showing_;
 
   // Window-specific bits that affect widget visibility.
   bool is_window_visible_;
   bool is_window_activity_started_;
 
   // ContentViewCoreImpl is our interface to the view system.
@@ skipping 64 matching lines @@
   gfx::Vector2dF last_scroll_offset_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_