[Sync] Migrate SyncInternalsMessageHandler off CallJavascriptFunctionUnsafe.

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 60 matching lines @@
 void SyncServiceBase::AddObserver(SyncServiceObserver* observer) {
   DCHECK(thread_checker_.CalledOnValidThread());
   observers_.AddObserver(observer);
 }
 
 void SyncServiceBase::RemoveObserver(SyncServiceObserver* observer) {
   DCHECK(thread_checker_.CalledOnValidThread());
   observers_.RemoveObserver(observer);
 }
 
+bool SyncServiceBase::HasObserver(const SyncServiceObserver* observer) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return observers_.HasObserver(observer);
+}
+
+SigninManagerBase* SyncServiceBase::signin() const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return signin_ ? signin_->GetOriginal() : nullptr;
+}
+
 // static
 base::FilePath SyncServiceBase::FormatSyncDataPath(
     const base::FilePath& base_directory) {
   return base_directory.Append(base::FilePath(kSyncDataFolderName));
 }
 
 // static
 base::FilePath SyncServiceBase::FormatSharedModelTypeStorePath(
     const base::FilePath& base_directory) {
   return FormatSyncDataPath(base_directory)
       .Append(base::FilePath(kLevelDBFolderName));
 }
 
-bool SyncServiceBase::HasObserver(const SyncServiceObserver* observer) const {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  return observers_.HasObserver(observer);
-}
-
 void SyncServiceBase::NotifyObservers() {
   for (auto& observer : observers_) {
     observer.OnStateChanged(this);
   }
 }
 
 void SyncServiceBase::InitializeEngine() {
   DCHECK(engine_);
 
   if (!sync_thread_) {
@@ skipping 45 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