Fix painting glitch with text and NPAPI plugins. This was a regression from r167042. The problem wa…

content/plugin/webplugin_proxy.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_PLUGIN_WEBPLUGIN_PROXY_H_
 #define CONTENT_PLUGIN_WEBPLUGIN_PROXY_H_
 
 #include <string>
 
 #include "base/hash_tables.h"
@@ skipping 262 matching lines @@
   // fields are for the front-buffer and back-buffer of a buffer flipping system
   // and windowless_buffer_index_ identifies which set we are using as the
   // back-buffer at any given time.
   int windowless_buffer_index_;
 #if defined(OS_MACOSX)
   scoped_ptr<TransportDIB> windowless_dibs_[2];
   base::mac::ScopedCFTypeRef<CGContextRef> windowless_contexts_[2];
   scoped_ptr<WebPluginAcceleratedSurfaceProxy> accelerated_surface_;
 #else
   skia::RefPtr<SkCanvas> windowless_canvases_[2];
-  skia::RefPtr<SkCanvas> background_canvas_;
 
 #if defined(USE_X11)
   scoped_refptr<SharedTransportDIB> windowless_dibs_[2];
   // If we can use SHM pixmaps for windowless plugin painting or not.
   bool use_shm_pixmap_;
   // The SHM pixmaps for windowless plugin painting.
   XID windowless_shm_pixmaps_[2];
 #endif
 
 #endif
 
   // Contains the routing id of the host render view.
   int host_render_view_routing_id_;
 
   base::WeakPtrFactory<WebPluginProxy> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PLUGIN_WEBPLUGIN_PROXY_H_