Remove static thread pointers from CC

cc/font_atlas.h

Index: cc/font_atlas.h
diff --git a/cc/font_atlas.h b/cc/font_atlas.h
index 0a227a69aa6484bfb63f5c4de341eff3a5dd77fd..f5878a7215f5cd27a079f8b73c52ac913df236cd 100644
--- a/cc/font_atlas.h
+++ b/cc/font_atlas.h
@@ -9,6 +9,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/rect.h"
 
@@ -54,6 +55,8 @@ private:
 
     int m_fontHeight;
 
+    base::ThreadChecker m_threadChecker;
+
     DISALLOW_COPY_AND_ASSIGN(FontAtlas);
 };