Revert of Make DOMWrapperWorld::current() return a reference instead of a pointer

Source/bindings/v8/V8DOMConfiguration.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 58 matching lines @@
         v8::PropertyAttribute attribute;
     };
 
     static void installAttributes(v8::Handle<v8::ObjectTemplate>, v8::Handle<v8::ObjectTemplate>, const AttributeConfiguration*, size_t attributeCount, v8::Isolate*);
 
     template<class ObjectOrTemplate>
     static inline void installAttribute(v8::Handle<ObjectOrTemplate> instanceTemplate, v8::Handle<ObjectOrTemplate> prototype, const AttributeConfiguration& attribute, v8::Isolate* isolate)
     {
         v8::AccessorGetterCallback getter = attribute.getter;
         v8::AccessorSetterCallback setter = attribute.setter;
-        if (DOMWrapperWorld::current(isolate).isMainWorld()) {
+        if (DOMWrapperWorld::current(isolate)->isMainWorld()) {
             if (attribute.getterForMainWorld)
                 getter = attribute.getterForMainWorld;
             if (attribute.setterForMainWorld)
                 setter = attribute.setterForMainWorld;
         }
         (attribute.onPrototype ? prototype : instanceTemplate)->SetAccessor(v8::String::NewFromUtf8(isolate, attribute.name, v8::String::kInternalizedString),
             getter,
             setter,
             v8::External::New(isolate, const_cast<WrapperTypeInfo*>(attribute.data)),
             attribute.settings,
@@ skipping 26 matching lines @@
     static v8::Local<v8::Signature> installDOMClassTemplate(v8::Handle<v8::FunctionTemplate>, const char* interfaceName, v8::Handle<v8::FunctionTemplate> parentClass, size_t fieldCount,
         const AttributeConfiguration*, size_t attributeCount,
         const AccessorConfiguration*, size_t accessorCount,
         const MethodConfiguration*, size_t callbackCount,
         v8::Isolate*);
 };
 
 } // namespace WebCore
 
 #endif // V8DOMConfiguration_h