Add shutdown notification and service refs to SyncServiceObserver.

components/suggestions/suggestions_service_impl.cc

 // Copyright 2014 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 "components/suggestions/suggestions_service_impl.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/feature_list.h"
@@ skipping 142 matching lines @@
       suggestions_store_(std::move(suggestions_store)),
       thumbnail_manager_(std::move(thumbnail_manager)),
       blacklist_store_(std::move(blacklist_store)),
       scheduling_delay_(TimeDelta::FromSeconds(kDefaultSchedulingDelaySec)),
       weak_ptr_factory_(this) {
   // |sync_service_| is null if switches::kDisableSync is set (tests use that).
   if (sync_service_)
     sync_service_observer_.Add(sync_service_);
   // Immediately get the current sync state, so we'll flush the cache if
   // necessary.
-  OnStateChanged();
+  OnStateChanged(sync_service_);
 }
 
 SuggestionsServiceImpl::~SuggestionsServiceImpl() {}
 
 bool SuggestionsServiceImpl::FetchSuggestionsData() {
   DCHECK(thread_checker_.CalledOnValidThread());
   // If sync state allows, issue a network request to refresh the suggestions.
   if (GetSyncState(sync_service_) != INITIALIZED_ENABLED_HISTORY)
     return false;
   IssueRequestIfNoneOngoing(BuildSuggestionsURL());
@@ skipping 118 matching lines @@
               net::EscapeQueryParamValue(candidate_url.spec(), true));
 }
 
 // static
 GURL SuggestionsServiceImpl::BuildSuggestionsBlacklistClearURL() {
   return GURL(base::StringPrintf(kSuggestionsBlacklistClearURLFormat,
                                  GetGoogleBaseURL().spec().c_str(),
                                  kDeviceType));
 }
 
-void SuggestionsServiceImpl::OnStateChanged() {
+void SuggestionsServiceImpl::OnStateChanged(syncer::SyncService* sync) {
   switch (GetSyncState(sync_service_)) {
     case SYNC_OR_HISTORY_SYNC_DISABLED:
       // Cancel any ongoing request, to stop interacting with the server.
       pending_request_.reset(nullptr);
       suggestions_store_->ClearSuggestions();
       callback_list_.Notify(SuggestionsProfile());
       break;
     case NOT_INITIALIZED_ENABLED:
       // Keep the cache (if any), but don't refresh.
       break;
@@ skipping 214 matching lines @@
     scheduling_delay_ = TimeDelta::FromSeconds(kDefaultSchedulingDelaySec);
   } else {
     TimeDelta candidate_delay =
         scheduling_delay_ * kSchedulingBackoffMultiplier;
     if (candidate_delay < TimeDelta::FromSeconds(kSchedulingMaxDelaySec))
       scheduling_delay_ = candidate_delay;
   }
 }
 
 }  // namespace suggestions