Oilpan: fix build after r194009.

Source/core/svg/properties/SVGPropertyTearOff.h

 /*
  * Copyright (C) 2013 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 14 matching lines @@
  * 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 SVGPropertyTearOff_h
 #define SVGPropertyTearOff_h
 
 #include "core/dom/QualifiedName.h"
+#include "core/svg/SVGElement.h"
 #include "core/svg/properties/SVGProperty.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 enum PropertyIsAnimValType {
     PropertyIsNotAnimVal,
     PropertyIsAnimVal
 };
@@ skipping 105 matching lines @@
         ASSERT(m_target);
     }
 
 private:
     RefPtrWillBeMember<Property> m_target;
 };
 
 }
 
 #endif // SVGPropertyTearOff_h