Use toDocument instead of static_cast<Document*>.

Source/WebKit/chromium/src/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 96 matching lines @@
         AllowIDBParams* allowIDBParams = static_cast<AllowIDBParams*>(params);
         return commonClient->allowIndexedDB(allowIDBParams->m_name);
     }
 };
 
 bool IDBFactoryBackendProxy::allowIndexedDB(ScriptExecutionContext* context, const String& name, const WebSecurityOrigin& origin, PassRefPtr<IDBCallbacks> callbacks)
 {
     bool allowed;
     ASSERT_WITH_SECURITY_IMPLICATION(context->isDocument() || context->isWorkerGlobalScope());
     if (context->isDocument()) {
-        Document* document = static_cast<Document*>(context);
+        Document* document = toDocument(context);
         WebFrameImpl* webFrame = WebFrameImpl::fromFrame(document->frame());
         WebViewImpl* webView = webFrame->viewImpl();
         // FIXME: webView->permissionClient() returns 0 in test_shell and content_shell http://crbug.com/137269
         allowed = !webView->permissionClient() || webView->permissionClient()->allowIndexedDB(webFrame, name, origin);
     } else {
         WorkerGlobalScope* workerGlobalScope = static_cast<WorkerGlobalScope*>(context);
         WebWorkerBase* webWorkerBase = static_cast<WebWorkerBase*>(workerGlobalScope->thread()->workerLoaderProxy().toWebWorkerBase());
         WorkerRunLoop& runLoop = workerGlobalScope->thread()->runLoop();
 
         String mode = allowIndexedDBMode;
@@ skipping 39 matching lines @@
 {
     RefPtr<IDBCallbacks> callbacks(prpCallbacks);
     WebSecurityOrigin origin(context->securityOrigin());
     if (!allowIndexedDB(context, name, origin, callbacks))
         return;
 
     m_webIDBFactory->deleteDatabase(name, new WebIDBCallbacksImpl(callbacks), databaseIdentifier);
 }
 
 } // namespace WebKit