Add shutdown notification and service refs to SyncServiceObserver.

components/suggestions/suggestions_service_impl.h

 // 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.
 
 #ifndef COMPONENTS_SUGGESTIONS_SUGGESTIONS_SERVICE_IMPL_H_
 #define COMPONENTS_SUGGESTIONS_SUGGESTIONS_SERVICE_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 94 matching lines @@
 
   // Helpers to build the various suggestions URLs. These are static members
   // rather than local functions in the .cc file to make them accessible to
   // tests.
   static GURL BuildSuggestionsURL();
   static std::string BuildSuggestionsBlacklistURLPrefix();
   static GURL BuildSuggestionsBlacklistURL(const GURL& candidate_url);
   static GURL BuildSuggestionsBlacklistClearURL();
 
   // syncer::SyncServiceObserver implementation.
-  void OnStateChanged() override;
+  void OnStateChanged(syncer::SyncService* sync) override;
 
   // Sets default timestamp for suggestions which do not have expiry timestamp.
   void SetDefaultExpiryTimestamp(SuggestionsProfile* suggestions,
                                  int64_t timestamp_usec);
 
   // Issues a network request if there isn't already one happening.
   void IssueRequestIfNoneOngoing(const GURL& url);
 
   // Called when an access token request completes (successfully or not).
   void AccessTokenAvailable(const GURL& url,
@@ skipping 77 matching lines @@
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<SuggestionsServiceImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SuggestionsServiceImpl);
 };
 
 }  // namespace suggestions
 
 #endif  // COMPONENTS_SUGGESTIONS_SUGGESTIONS_SERVICE_IMPL_H_