Restore KeyedServiceFactory diagnostics for context use-after-destroy.

chrome/browser/engagement/site_engagement_service.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_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_H_
 #define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 87 matching lines @@
   // thread and does not cause any cleanup, decay, etc.
   //
   // Should only be used if you cannot create a SiteEngagementService (i.e. you
   // cannot run on the UI thread).
   static double GetScoreFromSettings(HostContentSettingsMap* settings,
                                      const GURL& origin);
 
   explicit SiteEngagementService(Profile* profile);
   ~SiteEngagementService() override;
 
+  // KeyedService support:
+  void Shutdown() override;
+
   // Returns the engagement level of |url|.
   blink::mojom::EngagementLevel GetEngagementLevel(const GURL& url) const;
 
   // Returns a map of all stored origins and their engagement scores.
   std::map<GURL, double> GetScoreMap() const;
 
   // Returns whether the engagement service has enough data to make meaningful
   // decisions. Clients should avoid using engagement in their heuristic until
   // this is true.
   bool IsBootstrapped() const;
@@ skipping 170 matching lines @@
   // A list of observers. When any origin registers an engagement-increasing
   // event, each observer's OnEngagementIncreased method will be called.
   base::ObserverList<SiteEngagementObserver> observer_list_;
 
   base::WeakPtrFactory<SiteEngagementService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteEngagementService);
 };
 
 #endif  // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_H_