Touch.identifier should be long, not unsigned long

Source/core/dom/Touch.h

 /*
  * Copyright 2008, The Android Open Source Project
  *
  * 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 copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 27 matching lines @@
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class LocalFrame;
 
 class CORE_EXPORT Touch final : public RefCountedWillBeGarbageCollected<Touch>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<Touch> create(LocalFrame* frame, EventTarget* target,
-        unsigned identifier, const FloatPoint& screenPos, const FloatPoint& pagePos,
+        int identifier, const FloatPoint& screenPos, const FloatPoint& pagePos,
         const FloatSize& radius, float rotationAngle, float force)
     {
         return adoptRefWillBeNoop(
             new Touch(frame, target, identifier, screenPos, pagePos, radius, rotationAngle, force));
     }
 
     // DOM Touch implementation
     EventTarget* target() const { return m_target.get(); }
-    unsigned identifier() const { return m_identifier; }
+    int identifier() const { return m_identifier; }
     double clientX() const { return m_clientPos.x(); }
     double clientY() const { return m_clientPos.y(); }
     double screenX() const { return m_screenPos.x(); }
     double screenY() const { return m_screenPos.y(); }
     double pageX() const { return m_pagePos.x(); }
     double pageY() const { return m_pagePos.y(); }
     float radiusX() const { return m_radius.width(); }
     float radiusY() const { return m_radius.height(); }
     float rotationAngle() const { return m_rotationAngle; }
     float force() const { return m_force; }
 
     // Blink-internal methods
     const LayoutPoint& absoluteLocation() const { return m_absoluteLocation; }
     const FloatPoint& screenLocation() const { return m_screenPos; }
     PassRefPtrWillBeRawPtr<Touch> cloneWithNewTarget(EventTarget*) const;
 
     DECLARE_TRACE();
 
 private:
-    Touch(LocalFrame* frame, EventTarget* target, unsigned identifier,
+    Touch(LocalFrame*, EventTarget*, int identifier,
         const FloatPoint& screenPos, const FloatPoint& pagePos,
         const FloatSize& radius, float rotationAngle, float force);
 
-    Touch(EventTarget*, unsigned identifier, const FloatPoint& clientPos,
+    Touch(EventTarget*, int identifier, const FloatPoint& clientPos,
         const FloatPoint& screenPos, const FloatPoint& pagePos,
         const FloatSize& radius, float rotationAngle, float force, LayoutPoint absoluteLocation);
 
     RefPtrWillBeMember<EventTarget> m_target;
-    unsigned m_identifier;
+    int m_identifier;
     // Position relative to the viewport in CSS px.
     FloatPoint m_clientPos;
     // Position relative to the screen in DIPs.
     FloatPoint m_screenPos;
     // Position relative to the page in CSS px.
     FloatPoint m_pagePos;
     // Radius in CSS px.
     FloatSize m_radius;
     float m_rotationAngle;
     float m_force;
     // FIXME(rbyers): Shouldn't we be able to migrate callers to relying on screenPos, pagePos
     // or clientPos? absoluteLocation appears to be the same as pagePos but without browser
     // scale applied.
     LayoutPoint m_absoluteLocation;
 };
 
 } // namespace blink
 
 #endif // Touch_h