Clean up forward declarations in Source/modules

Source/modules/filesystem/DOMFileSystem.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 24 matching lines @@
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "modules/filesystem/DOMFileSystemBase.h"
 #include "modules/filesystem/EntriesCallback.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class DirectoryEntry;
-class File;
 class FileCallback;
 class FileEntry;
 class FileWriterCallback;
 
 class DOMFileSystem final : public DOMFileSystemBase, public ScriptWrappable, public ActiveDOMObject {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static DOMFileSystem* create(ExecutionContext*, const String& name, FileSystemType, const KURL& rootURL);
 
     // Creates a new isolated file system for the given filesystemId.
@@ skipping 183 matching lines @@
 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, CB* callback)
 {
     ASSERT(executionContext->isContextThread());
     if (callback)
         executionContext->postTask(adoptPtr(new DispatchCallbackNoArgTask<CB>(callback)));
 }
 
 } // namespace blink
 
 #endif // DOMFileSystem_h