Remove dom_loading from page_load_metrics

chrome/renderer/page_load_metrics/metrics_render_frame_observer.cc

Index: chrome/renderer/page_load_metrics/metrics_render_frame_observer.cc
diff --git a/chrome/renderer/page_load_metrics/metrics_render_frame_observer.cc b/chrome/renderer/page_load_metrics/metrics_render_frame_observer.cc
index 6cb12f0b957a367c0a6d62f394f115ca2816b878..ef32d84b88bcfd6a76e543df7748571467afc67e 100644
--- a/chrome/renderer/page_load_metrics/metrics_render_frame_observer.cc
+++ b/chrome/renderer/page_load_metrics/metrics_render_frame_observer.cc
@@ -124,8 +124,6 @@ PageLoadTiming MetricsRenderFrameObserver::GetTiming() const {
   timing.navigation_start = base::Time::FromDoubleT(start);
   if (perf.responseStart() > 0.0)
     timing.response_start = ClampDelta(perf.responseStart(), start);
-  if (perf.domLoading() > 0.0)
-    timing.dom_loading = ClampDelta(perf.domLoading(), start);
   if (perf.domContentLoadedEventStart() > 0.0)
     timing.dom_content_loaded_event_start =
         ClampDelta(perf.domContentLoadedEventStart(), start);