Remove tons of OILPAN.

sky/engine/core/html/canvas/HitRegion.cpp

Index: sky/engine/core/html/canvas/HitRegion.cpp
diff --git a/sky/engine/core/html/canvas/HitRegion.cpp b/sky/engine/core/html/canvas/HitRegion.cpp
index aa9b27bdd5cdcf7628d67ffa721e5551a65d2478..99f785f98a96cf49701da428c62492661adce7e2 100644
--- a/sky/engine/core/html/canvas/HitRegion.cpp
+++ b/sky/engine/core/html/canvas/HitRegion.cpp
@@ -31,11 +31,6 @@ void HitRegion::removePixels(const Path& clearArea)
     m_path.subtractPath(clearArea);
 }
 
-void HitRegion::trace(Visitor* visitor)
-{
-    visitor->trace(m_control);
-}
-
 void HitRegionManager::addHitRegion(PassRefPtr<HitRegion> passHitRegion)
 {
     RefPtr<HitRegion> hitRegion = passHitRegion;
@@ -133,15 +128,6 @@ unsigned HitRegionManager::getHitRegionsCount() const
     return m_hitRegionList.size();
 }
 
-void HitRegionManager::trace(Visitor* visitor)
-{
-#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