PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_file_ref_api.h

 // Copyright (c) 2011 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 PPAPI_THUNK_PPB_FILE_REF_API_H_
 #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 {
 
 struct PPB_FileRef_CreateInfo;
 
 namespace thunk {
 
 class PPAPI_THUNK_EXPORT PPB_FileRef_API {
  public:
   virtual ~PPB_FileRef_API() {}
 
   virtual PP_FileSystemType GetFileSystemType() const = 0;
   virtual PP_Var GetName() const = 0;
   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).
   virtual const PPB_FileRef_CreateInfo& GetCreateInfo() const = 0;
 
   // Private API
   virtual PP_Var GetAbsolutePath() = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_PPB_FILE_REF_API_H_