Add shutdown notification and service refs to SyncServiceObserver.

components/sync/driver/sync_service_base.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 "components/sync/driver/sync_service_base.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 69 matching lines @@
   observers_.RemoveObserver(observer);
 }
 
 bool SyncServiceBase::HasObserver(const SyncServiceObserver* observer) const {
   DCHECK(thread_checker_.CalledOnValidThread());
   return observers_.HasObserver(observer);
 }
 
 void SyncServiceBase::NotifyObservers() {
   for (auto& observer : observers_) {
-    observer.OnStateChanged();
+    observer.OnStateChanged(this);
   }
 }
 
 void SyncServiceBase::InitializeEngine() {
   DCHECK(engine_);
 
   if (!sync_thread_) {
     sync_thread_ = base::MakeUnique<base::Thread>("Chrome_SyncThread");
     base::Thread::Options options;
     options.timer_slack = base::TIMER_SLACK_MAXIMUM;
@@ skipping 71 matching lines @@
 void SyncServiceBase::ResetCryptoState() {
   crypto_ = base::MakeUnique<SyncServiceCrypto>(
       base::BindRepeating(&SyncServiceBase::NotifyObservers,
                           base::Unretained(this)),
       base::BindRepeating(&SyncService::GetPreferredDataTypes,
                           base::Unretained(this)),
       &sync_prefs_);
 }
 
 }  // namespace syncer