Change RefPtr<DOMWrapperWorld> that causes reference cycles to DOMWrapperWorld*

Source/bindings/v8/ScriptController.cpp

Index: Source/bindings/v8/ScriptController.cpp
diff --git a/Source/bindings/v8/ScriptController.cpp b/Source/bindings/v8/ScriptController.cpp
index cae9555cbc3d5d3a2cca4c62dcfad66a15379923..80a4fe1e20142193046a7954c7669a84aa523735 100644
--- a/Source/bindings/v8/ScriptController.cpp
+++ b/Source/bindings/v8/ScriptController.cpp
@@ -237,8 +237,9 @@ V8WindowShell* ScriptController::existingWindowShell(DOMWrapperWorld* world)
     return iter->value->isContextInitialized() ? iter->value.get() : 0;
 }
 
-V8WindowShell* ScriptController::windowShell(DOMWrapperWorld* world)
+V8WindowShell* ScriptController::windowShell(PassRefPtr<DOMWrapperWorld> prpWorld)
 {
+    RefPtr<DOMWrapperWorld> world = prpWorld;
     ASSERT(world);
 
     V8WindowShell* shell = 0;
@@ -255,7 +256,7 @@ V8WindowShell* ScriptController::windowShell(DOMWrapperWorld* world)
         }
     }
     if (!shell->isContextInitialized() && shell->initializeIfNeeded())
-        m_frame->loader().dispatchDidClearWindowObjectInWorld(world);
+        m_frame->loader().dispatchDidClearWindowObjectInWorld(world.get());
     return shell;
 }
 
@@ -628,8 +629,7 @@ void ScriptController::executeScriptInIsolatedWorld(int worldID, const Vector<Sc
     v8::Local<v8::Array> v8Results;
     {
         v8::EscapableHandleScope evaluateHandleScope(m_isolate);
-        RefPtr<DOMWrapperWorld> world = DOMWrapperWorld::ensureIsolatedWorld(worldID, extensionGroup);
-        V8WindowShell* isolatedWorldShell = windowShell(world.get());
+        V8WindowShell* isolatedWorldShell = windowShell(DOMWrapperWorld::ensureIsolatedWorld(worldID, extensionGroup));
 
         if (!isolatedWorldShell->isContextInitialized())
             return;