Make DocumentLoader::timing return a reference

Source/core/workers/WorkerMessagingProxy.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 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 104 matching lines @@
     // FIXME: This need to be revisited when we support nested worker one day
     ASSERT(m_executionContext->isDocument());
     if (m_askedToTerminate) {
         // Worker.terminate() could be called from JS before the thread was created.
         return;
     }
     Document* document = toDocument(m_executionContext.get());
     SecurityOrigin* starterOrigin = document->securityOrigin();
 
     OwnPtrWillBeRawPtr<WorkerThreadStartupData> startupData = WorkerThreadStartupData::create(scriptURL, userAgent, sourceCode, nullptr, startMode, document->contentSecurityPolicy()->deprecatedHeader(), document->contentSecurityPolicy()->deprecatedHeaderType(), starterOrigin, m_workerClients.release());
-    double originTime = document->loader() ? document->loader()->timing()->referenceMonotonicTime() : monotonicallyIncreasingTime();
+    double originTime = document->loader() ? document->loader()->timing().referenceMonotonicTime() : monotonicallyIncreasingTime();
 
     m_loaderProxy = WorkerLoaderProxy::create(this);
     RefPtr<DedicatedWorkerThread> thread = DedicatedWorkerThread::create(m_loaderProxy, *m_workerObjectProxy.get(), originTime, startupData.release());
     thread->start();
     workerThreadCreated(thread);
     m_workerInspectorProxy->workerThreadCreated(m_executionContext.get(), m_workerThread.get(), scriptURL);
 }
 
 void WorkerMessagingProxy::postMessageToWorkerObject(PassRefPtr<SerializedScriptValue> message, PassOwnPtr<MessagePortChannelArray> channels)
 {
@@ skipping 163 matching lines @@
 
     // FIXME: This need to be revisited when we support nested worker one day
     ASSERT(m_executionContext->isDocument());
     Document* document = toDocument(m_executionContext.get());
     LocalFrame* frame = document->frame();
     if (frame)
         frame->console().adoptWorkerMessagesAfterTermination(this);
 }
 
 } // namespace blink