Deprecate NavigationToFirstContentfulPaint.UserGesture reload variant

chrome/browser/page_load_metrics/observers/reload_page_load_metrics_observer.cc

 // Copyright 2016 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/observers/reload_page_load_metrics_observer.h"
 
 #include "chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h"
 #include "components/page_load_metrics/browser/page_load_metrics_util.h"
 #include "ui/base/page_transition_types.h"
 
 namespace chrome {
 
 namespace {
 
 const char kHistogramFirstContentfulPaintReload[] =
     "PageLoad.Clients.Reload.PaintTiming.NavigationToFirstContentfulPaint";
-const char kHistogramFirstContentfulPaintReloadByGesture[] =
-    "PageLoad.Clients.Reload.PaintTiming.NavigationToFirstContentfulPaint."
-    "UserGesture";
 
 }  // namespace
 
 ReloadPageLoadMetricsObserver::ReloadPageLoadMetricsObserver()
-    : page_transition_was_reload_(false), initiated_by_user_gesture_(false) {}
+    : page_transition_was_reload_(false) {}
 
 void ReloadPageLoadMetricsObserver::OnCommit(
     content::NavigationHandle* navigation_handle) {
   page_transition_was_reload_ = ui::PageTransitionCoreTypeIs(
       navigation_handle->GetPageTransition(), ui::PAGE_TRANSITION_RELOAD);
-  initiated_by_user_gesture_ = navigation_handle->HasUserGesture();
 }
 
 void ReloadPageLoadMetricsObserver::OnFirstContentfulPaint(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& extra_info) {
   if (!page_transition_was_reload_ ||
       !WasStartedInForegroundEventInForeground(timing.first_contentful_paint,
                                                extra_info)) {
     return;
   }
 
   PAGE_LOAD_HISTOGRAM(kHistogramFirstContentfulPaintReload,
                       timing.first_contentful_paint);
-  if (initiated_by_user_gesture_) {
-    PAGE_LOAD_HISTOGRAM(kHistogramFirstContentfulPaintReloadByGesture,
-                        timing.first_contentful_paint);
-  }
 }
 
 }  // namespace chrome