Remove an unnecessary reinterpret_cast from a persistent to an handle

Source/bindings/core/v8/WrapperTypeInfo.h

Index: Source/bindings/core/v8/WrapperTypeInfo.h
diff --git a/Source/bindings/core/v8/WrapperTypeInfo.h b/Source/bindings/core/v8/WrapperTypeInfo.h
index 49715ac4b9f6e93833ae9d0e9f6b8a1a536561e3..d4a9acc5859bbdf7805ed8cd2aed6a6aa38a6968 100644
--- a/Source/bindings/core/v8/WrapperTypeInfo.h
+++ b/Source/bindings/core/v8/WrapperTypeInfo.h
@@ -208,6 +208,11 @@ inline T* getInternalField(v8::Handle<v8::Object> wrapper)
     return static_cast<T*>(wrapper->GetAlignedPointerFromInternalField(offset));
 }
 
+inline ScriptWrappableBase* toScriptWrappableBase(const v8::Persistent<v8::Object>& wrapper)
+{
+    return getInternalField<ScriptWrappableBase, v8DOMWrapperObjectIndex>(wrapper);
+}
+
 inline ScriptWrappableBase* toScriptWrappableBase(v8::Handle<v8::Object> wrapper)
 {
     return getInternalField<ScriptWrappableBase, v8DOMWrapperObjectIndex>(wrapper);