Remove unused FS callback partial specializations.

Source/modules/filesystem/SyncCallbackHelper.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. 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.
@@ skipping 26 matching lines @@
 #include "core/html/VoidCallback.h"
 #include "modules/filesystem/DirectoryEntry.h"
 #include "modules/filesystem/EntriesCallback.h"
 #include "modules/filesystem/EntryCallback.h"
 #include "modules/filesystem/EntrySync.h"
 #include "modules/filesystem/ErrorCallback.h"
 #include "modules/filesystem/FileEntry.h"
 #include "modules/filesystem/FileSystemCallback.h"
 #include "modules/filesystem/MetadataCallback.h"
 #include "platform/heap/Handle.h"
-#include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 template <typename ResultType, typename CallbackArg>
 struct HelperResultType {
     DISALLOW_ALLOCATION();
 public:
     typedef ResultType* ReturnType;
     typedef Member<ResultType> StorageType;
 
@@ skipping 113 matching lines @@
 };
 
 typedef SyncCallbackHelper<EntryCallback, Entry*, EntrySync> EntrySyncCallbackHelper;
 typedef SyncCallbackHelper<MetadataCallback, Metadata*, Metadata> MetadataSyncCallbackHelper;
 typedef SyncCallbackHelper<VoidCallback, EmptyType*, EmptyType> VoidSyncCallbackHelper;
 typedef SyncCallbackHelper<FileSystemCallback, DOMFileSystem*, DOMFileSystemSync> FileSystemSyncCallbackHelper;
 
 } // namespace blink
 
 #endif // SyncCallbackHelper_h