bindings: Introduces type-check for the internal pointers.

Source/bindings/core/v8/V8GCController.cpp

Index: Source/bindings/core/v8/V8GCController.cpp
diff --git a/Source/bindings/core/v8/V8GCController.cpp b/Source/bindings/core/v8/V8GCController.cpp
index bd6b24d61c0d0dfab73b1cfb586d57066da24a25..3eead3e19febec976b71f78d7f4c94bba1bdf539 100644
--- a/Source/bindings/core/v8/V8GCController.cpp
+++ b/Source/bindings/core/v8/V8GCController.cpp
@@ -265,7 +265,6 @@ public:
             return;
 
         const WrapperTypeInfo* type = toWrapperTypeInfo(*wrapper);
-        void* object = toNative(*wrapper);
 
         ActiveDOMObject* activeDOMObject = type->toActiveDOMObject(*wrapper);
         if (activeDOMObject && activeDOMObject->hasPendingActivity())
@@ -273,7 +272,7 @@ public:
 
         if (classId == v8DOMNodeClassId) {
             ASSERT(V8Node::hasInstance(*wrapper, m_isolate));
-            Node* node = static_cast<Node*>(object);
+            Node* node = V8Node::toNative(*wrapper);
             if (node->hasEventListeners())
                 addReferencesForNodeWithEventListeners(m_isolate, node, v8::Persistent<v8::Object>::Cast(*value));
             Node* root = V8GCController::opaqueRootForGC(node, m_isolate);
@@ -281,7 +280,7 @@ public:
             if (m_constructRetainedObjectInfos)
                 m_groupsWhichNeedRetainerInfo.append(root);
         } else if (classId == v8DOMObjectClassId) {
-            type->visitDOMWrapper(object, v8::Persistent<v8::Object>::Cast(*value), m_isolate);
+            type->visitDOMWrapper(toInternalPointer(*wrapper), v8::Persistent<v8::Object>::Cast(*value), m_isolate);
         } else {
             ASSERT_NOT_REACHED();
         }