InlinedVisitor: Migrate html to use inlined tracing

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/dom/AXObjectCache.h"
 #include "core/rendering/RenderBoxModelObject.h"
 
@@ skipping 40 matching lines @@
 bool HitRegion::contains(const FloatPoint& point) const
 {
     return m_path.contains(point, m_fillRule);
 }
 
 void HitRegion::removePixels(const Path& clearArea)
 {
     m_path.subtractPath(clearArea);
 }
 
-void HitRegion::trace(Visitor* visitor)
+DEFINE_TRACE(HitRegion)
 {
     visitor->trace(m_control);
 }
 
 void HitRegionManager::addHitRegion(PassRefPtrWillBeRawPtr<HitRegion> passHitRegion)
 {
     RefPtrWillBeRawPtr<HitRegion> hitRegion = passHitRegion;
 
     m_hitRegionList.add(hitRegion);
 
@@ skipping 81 matching lines @@
     }
 
     return nullptr;
 }
 
 unsigned HitRegionManager::getHitRegionsCount() const
 {
     return m_hitRegionList.size();
 }
 
-void HitRegionManager::trace(Visitor* visitor)
+DEFINE_TRACE(HitRegionManager)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_hitRegionList);
     visitor->trace(m_hitRegionIdMap);
     visitor->trace(m_hitRegionControlMap);
 #endif
 }
 
 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(HitRegionManager)
 
 } // namespace blink