Enable Oilpan by default in modules/filesystem/

Source/modules/filesystem/DOMFilePath.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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DOMFilePath_h
 #define DOMFilePath_h
 
-#include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 // DOMFileSystem path utilities. All methods in this class are static.
 class DOMFilePath {
 public:
     static const char separator;
     static const char root[];
 
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     // Checks if the given name follows the FileSystem API naming restrictions.
     static bool isValidName(const String& name);
 
 private:
     DOMFilePath() { }
 };
 
 } // namespace WebCore
 
 #endif // DOMFilePath_h