PPAPI: Make blocking completion callbacks work.

webkit/plugins/ppapi/ppb_file_system_impl.h

 // Copyright (c) 2012 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 WEBKIT_PLUGINS_PPAPI_PPB_FILE_SYSTEM_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_FILE_SYSTEM_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "googleurl/src/gurl.h"
@@ skipping 15 matching lines @@
   // Resource overrides.
   virtual ::ppapi::thunk::PPB_FileSystem_API* AsPPB_FileSystem_API() OVERRIDE;
 
   PP_FileSystemType type() const { return type_; }
   const GURL& root_url() const { return root_url_; }
   void set_root_url(const GURL& root_url) { root_url_ = root_url; }
   bool opened() const { return opened_; }
   void set_opened(bool opened) { opened_ = opened; }
 
   // PPB_FileSystem_API implementation.
-  virtual int32_t Open(int64_t expected_size,
-                       PP_CompletionCallback callback) OVERRIDE;
+  virtual int32_t Open(
+      int64_t expected_size,
+      scoped_refptr< ::ppapi::TrackedCallback> callback) OVERRIDE;
   virtual PP_FileSystemType GetType() OVERRIDE;
 
  private:
   PPB_FileSystem_Impl(PP_Instance instance, PP_FileSystemType type);
 
   PP_FileSystemType type_;
   GURL root_url_;
   bool opened_;
   bool called_open_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_FileSystem_Impl);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_FILE_SYSTEM_IMPL_H_