Canvas2d: fix event.region being null on mouseleave/out events

third_party/WebKit/Source/modules/canvas2d/HitRegion.h

 // Copyright 2014 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 HitRegion_h
 #define HitRegion_h
 
 #include "core/dom/Element.h"
 #include "modules/canvas2d/HitRegionOptions.h"
 #include "platform/graphics/Path.h"
@@ skipping 37 matching lines @@
 class HitRegionManager final : public GarbageCollectedFinalized<HitRegionManager> {
     WTF_MAKE_NONCOPYABLE(HitRegionManager);
 public:
     static HitRegionManager* create() { return new HitRegionManager; }
     ~HitRegionManager() { }
 
     void addHitRegion(HitRegion*);
 
     void removeHitRegion(HitRegion*);
     void removeHitRegionById(const String& id);
-    void removeHitRegionByControl(Element*);
+    void removeHitRegionByControl(const Element*);
     void removeHitRegionsInRect(const FloatRect&, const AffineTransform&);
     void removeAllHitRegions();
 
     HitRegion* getHitRegionById(const String& id) const;
-    HitRegion* getHitRegionByControl(Element*) const;
+    HitRegion* getHitRegionByControl(const Element*) const;
     HitRegion* getHitRegionAtPoint(const FloatPoint&) const;
 
     unsigned getHitRegionsCount() const;
 
     DECLARE_TRACE();
 
 private:
     HitRegionManager() { }
 
     typedef HeapListHashSet<Member<HitRegion>> HitRegionList;
     typedef HitRegionList::const_reverse_iterator HitRegionIterator;
     typedef HeapHashMap<String, Member<HitRegion>> HitRegionIdMap;
-    typedef HeapHashMap<Member<Element>, Member<HitRegion>> HitRegionControlMap;
+    typedef HeapHashMap<Member<const Element>, Member<HitRegion>> HitRegionControlMap;
 
     HitRegionList m_hitRegionList;
     HitRegionIdMap m_hitRegionIdMap;
     HitRegionControlMap m_hitRegionControlMap;
 };
 
 } // namespace blink
 
 #endif