More cleanups on the CanvasRenderingContextHost front

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 257 matching lines @@
   TaskRunnerTimer<CanvasRenderingContext2D>
       dispatch_context_restored_event_timer_;
   TaskRunnerTimer<CanvasRenderingContext2D> try_restore_context_event_timer_;
 
   FilterOperations filter_operations_;
   HashMap<String, Font> fonts_resolved_using_current_style_;
   bool should_prune_local_font_cache_;
   ListHashSet<String> font_lru_list_;
 };
 
-// TODO(fserb): remove this?
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D,
                   CanvasRenderingContext,
                   context,
                   context->Is2d() && context->host(),
                   context.Is2d() && context.host());
 
 }  // namespace blink
 
 #endif  // CanvasRenderingContext2D_h