Make DocumentLoader::timing return a reference

Source/core/timing/PerformanceResourceTiming.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 26 matching lines @@
 #include "core/loader/DocumentLoader.h"
 #include "core/timing/ResourceTimingInfo.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 
 namespace blink {
 
 static double monotonicTimeToDocumentMilliseconds(Document* document, double seconds)
 {
     ASSERT(seconds >= 0.0);
-    return document->loader()->timing()->monotonicTimeToZeroBasedDocumentTime(seconds) * 1000.0;
+    return document->loader()->timing().monotonicTimeToZeroBasedDocumentTime(seconds) * 1000.0;
 }
 
 PerformanceResourceTiming::PerformanceResourceTiming(const ResourceTimingInfo& info, Document* requestingDocument, double startTime, double lastRedirectEndTime, bool allowTimingDetails, bool allowRedirectDetails)
     : PerformanceEntry(info.initialRequest().url().string(), "resource", monotonicTimeToDocumentMilliseconds(requestingDocument, startTime), monotonicTimeToDocumentMilliseconds(requestingDocument, info.loadFinishTime()))
     , m_initiatorType(info.initiatorType())
     , m_timing(info.finalResponse().resourceLoadTiming())
     , m_lastRedirectEndTime(lastRedirectEndTime)
     , m_finishTime(info.loadFinishTime())
     , m_didReuseConnection(info.finalResponse().connectionReused())
     , m_allowTimingDetails(allowTimingDetails)
@@ skipping 132 matching lines @@
     return monotonicTimeToDocumentMilliseconds(m_requestingDocument.get(), m_finishTime);
 }
 
 void PerformanceResourceTiming::trace(Visitor* visitor)
 {
     visitor->trace(m_requestingDocument);
     PerformanceEntry::trace(visitor);
 }
 
 } // namespace blink