Remove the Timing2 histograms that are deprecated.

chrome/browser/page_load_metrics/page_load_metrics_util.h

 // 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.
 
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_UTIL_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_UTIL_H_
 
 #include "base/metrics/histogram_macros.h"
 #include "base/optional.h"
 #include "base/time/time.h"
@@ skipping 15 matching lines @@
 // When a page is backgrounded, some events (e.g. paint) are delayed. Since
 // these data points can skew the mean, they should not be mixed with timing
 // events that occurred in the foreground.
 // If the event time delta and background time delta are equal, we still
 // consider the event to be logged in the foreground histogram since any
 // background specific handling would not yet have been applied to that event.
 bool WasStartedInForegroundOptionalEventInForeground(
     const base::Optional<base::TimeDelta>& event,
     const PageLoadExtraInfo& info);
 
-// Returns true if:
-// - Parse started and did not complete but the entire page load duration
-// happened in the foreground.
-// - Parse completed and happened entirely in the foreground.
-bool WasParseInForeground(const base::Optional<base::TimeDelta>& parse_start,
-                          const base::Optional<base::TimeDelta>& parse_stop,
-                          const PageLoadExtraInfo& info);
 }  // namespace page_load_metrics
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_UTIL_H_