A speculative Revert for r165872 - Remove static thread pointers from CC, attempt 2

cc/resource_provider.h

Index: cc/resource_provider.h
===================================================================
--- cc/resource_provider.h	(revision 165906)
+++ cc/resource_provider.h	(working copy)
@@ -8,7 +8,6 @@
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/threading/thread_checker.h"
 #include "cc/cc_export.h"
 #include "cc/graphics_context.h"
 #include "cc/texture_copier.h"
@@ -33,8 +32,8 @@
 
 class TextureUploader;
 
-// This class is not thread-safe and can only be called from the thread it was
-// created on (in practice, the impl thread).
+// Thread-safety notes: this class is not thread-safe and can only be called
+// from the thread it was created on (in practice, the compositor thread).
 class CC_EXPORT ResourceProvider {
 public:
     typedef unsigned ResourceId;
@@ -263,8 +262,6 @@
     scoped_ptr<AcceleratedTextureCopier> m_textureCopier;
     int m_maxTextureSize;
 
-    base::ThreadChecker m_threadChecker;
-
     DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };