Have WorkerScriptController::workerGlobalScope return a reference

Source/wtf/PassRefPtr.h

Index: Source/wtf/PassRefPtr.h
diff --git a/Source/wtf/PassRefPtr.h b/Source/wtf/PassRefPtr.h
index 9956c78e345e380cf39c6aaf848c88fdf7a04c24..49f244e1884617b7340a23ecaf35fc55e8ab3c85 100644
--- a/Source/wtf/PassRefPtr.h
+++ b/Source/wtf/PassRefPtr.h
@@ -60,6 +60,7 @@ namespace WTF {
     public:
         PassRefPtr() : m_ptr(0) { }
         PassRefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(ptr); }
+        explicit PassRefPtr(T& ptr) : m_ptr(&ptr) { m_ptr->ref(); }
         // It somewhat breaks the type system to allow transfer of ownership out of
         // a const PassRefPtr. However, it makes it much easier to work with PassRefPtr
         // temporaries, and we don't have a need to use real const PassRefPtrs anyway.