Rename nacl::RefCounted to nacl::RefCountedThreadSafe

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.h

Index: ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.h
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.h b/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.h
index 7a274a4da08b4d52f61dce91518e5dd9235d59e3..5d7bc830fc60d62ebd3e372928702724ed34dd6b 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.h
+++ b/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.h
@@ -15,7 +15,6 @@ namespace ppapi_proxy {
 class PluginImageData : public PluginResource {
  public:
   PluginImageData();
-  virtual ~PluginImageData();
 
   static const PPB_ImageData* GetInterface();
 
@@ -24,13 +23,18 @@ class PluginImageData : public PluginResource {
   void Unmap();
 
   const PP_ImageDataDesc& desc() const { return desc_; }
+
+ protected:
+  virtual ~PluginImageData();
+
  private:
-  IMPLEMENT_RESOURCE(PluginImageData);
-  NACL_DISALLOW_COPY_AND_ASSIGN(PluginImageData);
   PP_ImageDataDesc desc_;
   int shm_fd_;
   int32_t shm_size_;
   void* addr_;
+
+  IMPLEMENT_RESOURCE(PluginImageData);
+  NACL_DISALLOW_COPY_AND_ASSIGN(PluginImageData);
 };
 
 }  // namespace ppapi_proxy