Stop tracking user input events without a relevant load.

components/page_load_metrics/browser/metrics_web_contents_observer.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 COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_WEB_CONTENTS_OBSERVER_H_
 #define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_WEB_CONTENTS_OBSERVER_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 71 matching lines @@
   // cc file for details). We use this error counter to understand how often it
   // happens.
   ERR_ABORT_BEFORE_NAVIGATION_START,
 
   // A new navigation triggers abort updates in multiple trackers in
   // |aborted_provisional_loads_|, when usually there should only be one (the
   // navigation that just aborted because of this one). If this happens, the
   // latest aborted load is used to track the chain size.
   ERR_NAVIGATION_SIGNALS_MULIPLE_ABORTED_LOADS,
 
-  // Receives user input before navigation start
-  ERR_USER_INPUT_WITH_NO_RELEVANT_LOAD,
+  // Received user input without a relevant load. This error type is deprecated,
+  // as it is valid to receive user input without a relevant load. We leave the
+  // enum value here since it's also used in histogram recording, so it's
+  // important that we not re-use this enum entry for a different value.
+  DEPRECATED_ERR_USER_INPUT_WITH_NO_RELEVANT_LOAD,
 
   // A TimeTicks value in the browser process has value less than
   // navigation_start_. This could happen if navigation_start_ was computed in
   // renderer process and the system clock has inter process time tick skew.
   ERR_INTER_PROCESS_TIME_TICK_SKEW,
 
   // Add values before this final count.
   ERR_LAST_ENTRY,
 };
 
@@ skipping 238 matching lines @@
 
   // Has the MWCO observed at least one navigation?
   bool has_navigated_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsWebContentsObserver);
 };
 
 }  // namespace page_load_metrics
 
 #endif  // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_WEB_CONTENTS_OBSERVER_H_