Report nav timing 2 instance as soon as it's requested.

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index fd0186908321f7565e80a6e561e2791268d01a42..a610945e179208042c6860e957fdaf441dfa6e36 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -67,6 +67,7 @@
 #include "platform/mhtml/ArchiveResource.h"
 #include "platform/network/ContentSecurityPolicyResponseHeaders.h"
 #include "platform/network/HTTPParsers.h"
+#include "platform/network/ResourceTimingInfo.h"
 #include "platform/network/mime/MIMETypeRegistry.h"
 #include "platform/plugins/PluginData.h"
 #include "platform/weborigin/SchemeRegistry.h"
@@ -164,7 +165,9 @@ unsigned long DocumentLoader::mainResourceIdentifier() const {
   return m_mainResource ? m_mainResource->identifier() : 0;
 }
 
-ResourceTimingInfo* DocumentLoader::getNavigationTimingInfo() const {
+std::unique_ptr<ResourceTimingInfo> DocumentLoader::getNavigationTimingInfo()
+    const {
+  DCHECK(fetcher());
   return fetcher()->getNavigationTimingInfo();
 }