PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_file_ref_api.h

Index: ppapi/thunk/ppb_file_ref_api.h
diff --git a/ppapi/thunk/ppb_file_ref_api.h b/ppapi/thunk/ppb_file_ref_api.h
index ca7400376659b921177d04e89be19104913d8acb..c5892eab088df9b197a6adeca1d5f08ce2c987ae 100644
--- a/ppapi/thunk/ppb_file_ref_api.h
+++ b/ppapi/thunk/ppb_file_ref_api.h
@@ -6,6 +6,7 @@
 #define PPAPI_THUNK_PPB_FILE_REF_API_H_
 
 #include "ppapi/c/ppb_file_ref.h"
+#include "ppapi/shared_impl/api_callback_type.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
@@ -23,13 +24,13 @@ class PPAPI_THUNK_EXPORT PPB_FileRef_API {
   virtual PP_Var GetPath() const = 0;
   virtual PP_Resource GetParent() = 0;
   virtual int32_t MakeDirectory(PP_Bool make_ancestors,
-                                PP_CompletionCallback callback) = 0;
+                                ApiCallbackType callback) = 0;
   virtual int32_t Touch(PP_Time last_access_time,
                         PP_Time last_modified_time,
-                        PP_CompletionCallback callback) = 0;
-  virtual int32_t Delete(PP_CompletionCallback callback) = 0;
+                        ApiCallbackType callback) = 0;
+  virtual int32_t Delete(ApiCallbackType callback) = 0;
   virtual int32_t Rename(PP_Resource new_file_ref,
-                         PP_CompletionCallback callback) = 0;
+                         ApiCallbackType callback) = 0;
 
   // Intermal function for use in proxying. Returns the internal CreateInfo
   // (the contained resource does not carry a ref on behalf of the caller).