Should call clear() for controls when calling removeAllHitRegions().

Source/core/html/canvas/HitRegion.cpp

 // 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.
 
 #include "config.h"
 #include "core/html/canvas/HitRegion.h"
 
 #include "core/accessibility/AXObjectCache.h"
 #include "core/rendering/RenderBoxModelObject.h"
 
@@ skipping 97 matching lines @@
         hitRegion->removePixels(clearArea);
         if (hitRegion->path().isEmpty())
             removeHitRegion(hitRegion.get());
     }
 }
 
 void HitRegionManager::removeAllHitRegions()
 {
     m_hitRegionList.clear();
     m_hitRegionIdMap.clear();
+    m_hitRegionControlMap.clear();
 }
 
 HitRegion* HitRegionManager::getHitRegionById(const String& id) const
 {
     return m_hitRegionIdMap.get(id);
 }
 
 HitRegion* HitRegionManager::getHitRegionByControl(Element* control) const
 {
     if (control)
@@ skipping 23 matching lines @@
 void HitRegionManager::trace(Visitor* visitor)
 {
     visitor->trace(m_hitRegionList);
     visitor->trace(m_hitRegionIdMap);
     visitor->trace(m_hitRegionControlMap);
 }
 
 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(HitRegionManager)
 
 } // namespace WebCore