Decouple FileSystem and WebSQL callbacks from VoidCallback and it non-refcounted

Source/modules/filesystem/FileSystemCallbacks.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 class DirectoryReaderBase;
 class EntriesCallback;
 class EntryCallback;
 class ErrorCallback;
 struct FileMetadata;
 class FileSystemCallback;
 class FileWriterBase;
 class FileWriterBaseCallback;
 class MetadataCallback;
 class ExecutionContext;
-class VoidCallback;
+class FileSystemVoidCallback;
 
 class FileSystemCallbacksBase : public AsyncFileSystemCallbacks {
 public:
     virtual ~FileSystemCallbacksBase();
 
     // For ErrorCallback.
     virtual void didFail(int code) OVERRIDE;
 
     // Other callback methods are implemented by each subclass.
 
@@ skipping 70 matching lines @@
     virtual void didCreateFileWriter(PassOwnPtr<blink::WebFileWriter>, long long length);
 
 private:
     FileWriterBaseCallbacks(PassRefPtr<FileWriterBase>, PassRefPtr<FileWriterBaseCallback>, PassRefPtr<ErrorCallback>);
     RefPtr<FileWriterBase> m_fileWriter;
     RefPtr<FileWriterBaseCallback> m_successCallback;
 };
 
 class VoidCallbacks : public FileSystemCallbacksBase {
 public:
-    static PassOwnPtr<AsyncFileSystemCallbacks> create(PassRefPtr<VoidCallback>, PassRefPtr<ErrorCallback>, DOMFileSystemBase*);
+    static PassOwnPtr<AsyncFileSystemCallbacks> create(PassRefPtr<FileSystemVoidCallback>, PassRefPtr<ErrorCallback>, DOMFileSystemBase*);
     virtual void didSucceed();
 
 private:
-    VoidCallbacks(PassRefPtr<VoidCallback>, PassRefPtr<ErrorCallback>, DOMFileSystemBase*);
-    RefPtr<VoidCallback> m_successCallback;
+    VoidCallbacks(PassRefPtr<FileSystemVoidCallback>, PassRefPtr<ErrorCallback>, DOMFileSystemBase*);
+    RefPtr<FileSystemVoidCallback> m_successCallback;
 };
 
 } // namespace
 
 #endif // FileSystemCallbacks_h