Remove dom_loading from page_load_metrics

chrome/renderer/page_load_metrics/metrics_render_frame_observer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/page_load_metrics/metrics_render_frame_observer.h"
 
 #include <string>
 
 #include "base/memory/ptr_util.h"
 #include "base/time/time.h"
@@ skipping 106 matching lines @@
 
 PageLoadTiming MetricsRenderFrameObserver::GetTiming() const {
   const blink::WebPerformance& perf =
       render_frame()->GetWebFrame()->performance();
 
   PageLoadTiming timing;
   double start = perf.navigationStart();
   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);
   if (perf.loadEventStart() > 0.0)
     timing.load_event_start = ClampDelta(perf.loadEventStart(), start);
   if (perf.firstLayout() > 0.0)
     timing.first_layout = ClampDelta(perf.firstLayout(), start);
   if (perf.firstPaint() > 0.0)
     timing.first_paint = ClampDelta(perf.firstPaint(), start);
   if (perf.firstTextPaint() > 0.0)
@@ skipping 27 matching lines @@
   bool no_frame = !render_frame() || !render_frame()->GetWebFrame();
   DCHECK(!no_frame);
   return no_frame;
 }
 
 void MetricsRenderFrameObserver::OnDestruct() {
   delete this;
 }
 
 }  // namespace page_load_metrics