Remove the Timing2 histograms that are deprecated.

chrome/browser/page_load_metrics/page_load_metrics_util.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_util.h"
 
 #include <algorithm>
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
 #include "chrome/common/page_load_metrics/page_load_timing.h"
 
 namespace page_load_metrics {
 
 bool WasStartedInForegroundOptionalEventInForeground(
     const base::Optional<base::TimeDelta>& event,
     const PageLoadExtraInfo& info) {
   return info.started_in_foreground && event &&
          (!info.first_background_time ||
           event.value() <= info.first_background_time.value());
 }
 
-bool WasParseInForeground(const base::Optional<base::TimeDelta>& parse_start,
-                          const base::Optional<base::TimeDelta>& parse_stop,
-                          const PageLoadExtraInfo& info) {
-  if (!parse_start) {
-    return false;
-  }
-  const bool incomplete_parse_in_foreground =
-      !parse_stop && info.started_in_foreground && !info.first_background_time;
-
-  return incomplete_parse_in_foreground ||
-         WasStartedInForegroundOptionalEventInForeground(parse_stop, info);
-}
 }  // namespace page_load_metrics