Convert ppapi/shared to use TrackedCallback.

ppapi/shared_impl/ppb_file_io_shared.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_SHARED_IMPL_PPB_FILE_IO_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_FILE_IO_SHARED_H_
 
 #include <deque>
 
 #include "base/compiler_specific.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 #include "ppapi/shared_impl/resource.h"
+#include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/thunk/ppb_file_io_api.h"
 
 namespace ppapi {
 
 namespace thunk {
 class PPB_FileRef_API;
 }
 
 class PPAPI_SHARED_EXPORT PPB_FileIO_Shared : public Resource,
                                               public thunk::PPB_FileIO_API {
@@ skipping 32 matching lines @@
   void ExecuteOpenFileCallback(int32_t pp_error);
   void ExecuteQueryCallback(int32_t pp_error, const PP_FileInfo& info);
   void ExecuteReadCallback(int32_t pp_error, const char* data);
 
  protected:
   struct CallbackEntry {
     CallbackEntry();
     CallbackEntry(const CallbackEntry& entry);
     ~CallbackEntry();
 
-    PP_CompletionCallback callback;
+    scoped_refptr<TrackedCallback> callback;
 
     // Pointer back to the caller's read buffer; only used by |Read()|, NULL
     // for non-read operations. Not owned.
     char* read_buffer;
 
     // Pointer back to the caller's PP_FileInfo structure for Query operations.
     // NULL for non-query operations. Not owned.
     PP_FileInfo* info;
   };
 
@@ skipping 72 matching lines @@
 
   std::deque<CallbackEntry> callbacks_;
   OperationType pending_op_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_FileIO_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_FILE_IO_SHARED_H_