[Sync] Move //components/sync to the syncer namespace.

ios/chrome/browser/sync/sync_setup_service_mock.cc

 // Copyright 2013 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 "ios/chrome/browser/sync/sync_setup_service_mock.h"
 
-SyncSetupServiceMock::SyncSetupServiceMock(
-    sync_driver::SyncService* sync_service,
-    PrefService* prefs)
-    : SyncSetupService(sync_service, prefs) {
-}
+SyncSetupServiceMock::SyncSetupServiceMock(syncer::SyncService* sync_service,
+                                           PrefService* prefs)
+    : SyncSetupService(sync_service, prefs) {}
 
 SyncSetupServiceMock::~SyncSetupServiceMock() {
 }
 
 bool SyncSetupServiceMock::SyncSetupServiceHasFinishedInitialSetup() {
   return SyncSetupService::HasFinishedInitialSetup();
 }