Fix webkitGetEntry for non-native files.

third_party/WebKit/Source/core/clipboard/DraggedIsolatedFileSystem.h

 // Copyright 2015 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 DraggedIsolatedFileSystem_h
 #define DraggedIsolatedFileSystem_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class DataObject;
 
 class CORE_EXPORT DraggedIsolatedFileSystem {
   WTF_MAKE_NONCOPYABLE(DraggedIsolatedFileSystem);
 
  public:
   DraggedIsolatedFileSystem() {}
   virtual ~DraggedIsolatedFileSystem() {}
 
-  using FileSystemIdPreparationCallback = void (*)(DataObject*, const String&);
+  using FileSystemIdPreparationCallback = void (*)(DataObject*);
   static void init(FileSystemIdPreparationCallback);
 
-  static void prepareForDataObject(DataObject*, const String& filesystemId);
+  static void prepareForDataObject(DataObject*);
 
  private:
   static FileSystemIdPreparationCallback s_prepareCallback;
 };
 
 }  // namespace blink
 
 #endif  // DraggedIsolatedFileSystem_h