Pass implementation object to supplemental classes by reference

Source/web/IDBFactoryBackendProxy.cpp

 /*
  * Copyright (C) 2011 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 43 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(context->isDocument() || context->isWorkerGlobalScope());
 
     if (context->isDocument()) {
         WebSecurityOrigin origin(context->securityOrigin());
         Document* document = toDocument(context);
         WebFrameImpl* webFrame = WebFrameImpl::fromFrame(document->frame());
         // FIXME: webFrame->permissionClient() returns 0 in test_shell and content_shell http://crbug.com/137269
         return !webFrame->permissionClient() || webFrame->permissionClient()->allowIndexedDB(webFrame, name, origin);
     }
 
-    WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
+    WorkerGlobalScope& workerGlobalScope = *toWorkerGlobalScope(context);
     return WorkerPermissionClient::from(workerGlobalScope)->allowIndexedDB(name);
 }
 
 } // namespace blink