Remove PageLoad.Timing2.NavigationToCommit histograms.

chrome/browser/page_load_metrics/page_load_metrics_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/browser/page_load_metrics/page_load_metrics_observer.h"
 
 namespace page_load_metrics {
 
 PageLoadExtraInfo::PageLoadExtraInfo(
     const base::Optional<base::TimeDelta>& first_background_time,
     const base::Optional<base::TimeDelta>& first_foreground_time,
     bool started_in_foreground,
     bool user_gesture,
     const GURL& committed_url,
     const GURL& start_url,
-    const base::Optional<base::TimeDelta>& time_to_commit,
     UserAbortType abort_type,
     bool abort_user_initiated,
     const base::Optional<base::TimeDelta>& time_to_abort,
     int num_cache_requests,
     int num_network_requests,
     const PageLoadMetadata& metadata)
     : first_background_time(first_background_time),
       first_foreground_time(first_foreground_time),
       started_in_foreground(started_in_foreground),
       user_gesture(user_gesture),
       committed_url(committed_url),
       start_url(start_url),
-      time_to_commit(time_to_commit),
       abort_type(abort_type),
       abort_user_initiated(abort_user_initiated),
       time_to_abort(time_to_abort),
       num_cache_requests(num_cache_requests),
       num_network_requests(num_network_requests),
       metadata(metadata) {}
 
 PageLoadExtraInfo::PageLoadExtraInfo(const PageLoadExtraInfo& other) = default;
 
 PageLoadExtraInfo::~PageLoadExtraInfo() {}
@@ skipping 17 matching lines @@
 }
 
 PageLoadMetricsObserver::ObservePolicy
 PageLoadMetricsObserver::FlushMetricsOnAppEnterBackground(
     const PageLoadTiming& timing,
     const PageLoadExtraInfo& extra_info) {
   return CONTINUE_OBSERVING;
 }
 
 }  // namespace page_load_metrics