Oilpan: Remove ref counting from EventTarget and all uses of Pass/RefPtr<EventTarget>.

Source/core/page/EventHandler.h

Index: Source/core/page/EventHandler.h
diff --git a/Source/core/page/EventHandler.h b/Source/core/page/EventHandler.h
index 5f8aaca146fe2b8cea2a38f445ef46643203e854..b509417032cbe547896a716fe2e8d7faac190a2f 100644
--- a/Source/core/page/EventHandler.h
+++ b/Source/core/page/EventHandler.h
@@ -367,8 +367,9 @@ private:
     RefPtrWillBePersistent<Node> m_previousWheelScrolledNode;
 
     // The target of each active touch point indexed by the touch ID.
-    typedef HashMap<unsigned, RefPtr<EventTarget>, DefaultHash<unsigned>::Hash, WTF::UnsignedWithZeroKeyHashTraits<unsigned> > TouchTargetMap;
-    TouchTargetMap m_targetForTouchID;
+    typedef WillBeHeapHashMap<unsigned, RefPtrWillBeMember<EventTarget>, DefaultHash<unsigned>::Hash, WTF::UnsignedWithZeroKeyHashTraits<unsigned> > TouchTargetMap;
+    typedef WillBePersistentHeapHashMap<unsigned, RefPtrWillBeMember<EventTarget>, DefaultHash<unsigned>::Hash, WTF::UnsignedWithZeroKeyHashTraits<unsigned> > PersistentTouchTargetMap;
+    PersistentTouchTargetMap m_targetForTouchID;
 
     // If set, the document of the active touch sequence. Unset if no touch sequence active.
     RefPtrWillBePersistent<Document> m_touchSequenceDocument;