Delete ThreadChecker from FontAtlas.

cc/font_atlas.h

 // Copyright 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 CC_FONT_ATLAS_H_
 #define CC_FONT_ATLAS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/threading/thread_checker.h"
 #include "cc/cc_export.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/rect.h"
 
 class SkCanvas;
 
 namespace gfx {
 class Point;
 class Size;
 }
@@ skipping 32 matching lines @@
     void drawOneLineOfTextInternal(SkCanvas*, const SkPaint&, const std::string&, const gfx::Point& destPosition) const;
 
     // The actual texture atlas containing all the pre-rendered glyphs.
     SkBitmap m_atlas;
 
     // The look-up tables mapping ascii characters to their gfx::Rect locations on the atlas.
     gfx::Rect m_asciiToRectTable[128];
 
     int m_fontHeight;
 
-    base::ThreadChecker m_threadChecker;
-
     DISALLOW_COPY_AND_ASSIGN(FontAtlas);
 };
 
 }  // namespace cc
 
 #endif  // CC_FONT_ATLAS_H_