Make DocumentLoader::timing return a reference

Source/modules/webmidi/MIDIAccess.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 124 matching lines @@
     ASSERT(isMainThread());
     if (portIndex >= m_inputs.size())
         return;
 
     // Convert from time in seconds which is based on the time coordinate system of monotonicallyIncreasingTime()
     // into time in milliseconds (a DOMHighResTimeStamp) according to the same time coordinate system as performance.now().
     // This is how timestamps are defined in the Web MIDI spec.
     Document* document = toDocument(executionContext());
     ASSERT(document);
 
-    double timeStampInMilliseconds = 1000 * document->loader()->timing()->monotonicTimeToZeroBasedDocumentTime(timeStamp);
+    double timeStampInMilliseconds = 1000 * document->loader()->timing().monotonicTimeToZeroBasedDocumentTime(timeStamp);
 
     m_inputs[portIndex]->didReceiveMIDIData(portIndex, data, length, timeStampInMilliseconds);
 }
 
 void MIDIAccess::sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStampInMilliseconds)
 {
     if (!data || !length || portIndex >= m_outputs.size())
         return;
     // Convert from a time in milliseconds (a DOMHighResTimeStamp) according to the same time coordinate system as performance.now()
     // into a time in seconds which is based on the time coordinate system of monotonicallyIncreasingTime().
     double timeStamp;
 
     if (!timeStampInMilliseconds) {
         // We treat a value of 0 (which is the default value) as special, meaning "now".
         // We need to translate it exactly to 0 seconds.
         timeStamp = 0;
     } else {
         Document* document = toDocument(executionContext());
         ASSERT(document);
-        double documentStartTime = document->loader()->timing()->referenceMonotonicTime();
+        double documentStartTime = document->loader()->timing().referenceMonotonicTime();
         timeStamp = documentStartTime + 0.001 * timeStampInMilliseconds;
     }
 
     m_accessor->sendMIDIData(portIndex, data, length, timeStamp);
 }
 
 void MIDIAccess::stop()
 {
     m_accessor.clear();
 }
 
 DEFINE_TRACE(MIDIAccess)
 {
     visitor->trace(m_inputs);
     visitor->trace(m_outputs);
     RefCountedGarbageCollectedEventTargetWithInlineData<MIDIAccess>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink