Remove modules/filesystem/DraggedIsolatedFileSystem.h dependency from core/DEPS.

Source/core/page/DragData.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
 
 #include "config.h"
 #include "core/page/DragData.h"
 
 #include "core/clipboard/DataObject.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentFragment.h"
 #include "core/dom/Range.h"
 #include "core/editing/markup.h"
 #include "core/frame/LocalFrame.h"
-#include "modules/filesystem/DraggedIsolatedFileSystem.h"
 #include "platform/FileMetadata.h"
 #include "platform/clipboard/ClipboardMimeTypes.h"
 #include "platform/weborigin/KURL.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 DragData::DragData(DataObject* data, const IntPoint& clientPosition, const IntPoint& globalPosition,
     DragOperation sourceOperationMask, DragApplicationFlags flags)
     : m_clientPosition(clientPosition)
@@ skipping 109 matching lines @@
         ASSERT(frame->document());
         if (RefPtr<DocumentFragment> fragment = createFragmentFromMarkup(*frame->document(), html, baseURL, DisallowScriptingAndPluginContent))
             return fragment.release();
     }
 
     return nullptr;
 }
 
 String DragData::droppedFileSystemId() const
 {
-    DraggedIsolatedFileSystem* filesystem = DraggedIsolatedFileSystem::from(m_platformDragData);
-    if (!filesystem)
-        return String();
-    return filesystem->filesystemId();
+    return m_platformDragData->filesystemId();
 }
 
 } // namespace WebCore