[Sync] Migrate SyncInternalsMessageHandler off CallJavascriptFunctionUnsafe.

components/browser_sync/profile_sync_service.h

 // Copyright (c) 2012 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_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 478 matching lines @@
   virtual syncer::ModelTypeSet GetRegisteredDataTypes() const;
 
   // See the SyncServiceCrypto header.
   virtual syncer::PassphraseType GetPassphraseType() const;
   virtual bool IsEncryptEverythingAllowed() const;
   virtual void SetEncryptEverythingAllowed(bool allowed);
 
   // Returns true if the syncer is waiting for new datatypes to be encrypted.
   virtual bool encryption_pending() const;
 
-  SigninManagerBase* signin() const;
-
   syncer::SyncErrorController* sync_error_controller() {
     return sync_error_controller_.get();
   }
 
   // TODO(sync): This is only used in tests.  Can we remove it?
   const syncer::DataTypeStatusTable& data_type_status_table() const;
 
   syncer::DataTypeManager::ConfigureStatus configure_status() {
     return configure_status_;
   }
@@ skipping 385 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(const syncer::SyncProtocolError& error);
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_