Make DocumentLoader::timing return a reference

Source/core/inspector/InspectorResourceAgent.cpp

Index: Source/core/inspector/InspectorResourceAgent.cpp
diff --git a/Source/core/inspector/InspectorResourceAgent.cpp b/Source/core/inspector/InspectorResourceAgent.cpp
index 1663aeaf7a4f434da3ee58d98f978236dc359bc7..059f6e8e51d4372e0d36c882e429130d19a44af9 100644
--- a/Source/core/inspector/InspectorResourceAgent.cpp
+++ b/Source/core/inspector/InspectorResourceAgent.cpp
@@ -276,7 +276,7 @@ void InspectorResourceAgent::restore()
 static PassRefPtr<TypeBuilder::Network::ResourceTiming> buildObjectForTiming(const ResourceLoadTiming& timing, DocumentLoader* loader)
 {
     return TypeBuilder::Network::ResourceTiming::create()
-        .setRequestTime(loader->timing()->monotonicTimeToPseudoWallTime(timing.requestTime()))
+        .setRequestTime(loader->timing().monotonicTimeToPseudoWallTime(timing.requestTime()))
         .setProxyStart(timing.calculateMillisecondDelta(timing.proxyStart()))
         .setProxyEnd(timing.calculateMillisecondDelta(timing.proxyEnd()))
         .setDnsStart(timing.calculateMillisecondDelta(timing.dnsStart()))
@@ -541,7 +541,7 @@ void InspectorResourceAgent::didFinishLoading(unsigned long identifier, Document
     double finishTime = 0.0;
     // FIXME: Expose all of the timing details to inspector and have it calculate finishTime.
     if (monotonicFinishTime)
-        finishTime = loader->timing()->monotonicTimeToPseudoWallTime(monotonicFinishTime);
+        finishTime = loader->timing().monotonicTimeToPseudoWallTime(monotonicFinishTime);
 
     String requestId = IdentifiersFactory::requestId(identifier);
     m_resourcesData->maybeDecodeDataToContent(requestId);