Remove dependency of PrefSyncableService on Profile.

chrome/browser/prefs/pref_service_syncable_util.cc

+// Copyright 2015 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 "chrome/browser/prefs/pref_service_syncable_util.h"
+
+#include "chrome/browser/prefs/pref_service_syncable.h"
+#include "chrome/browser/profiles/profile.h"
+
+PrefServiceSyncable* PrefServiceSyncableFromProfile(Profile* profile) {
+  return static_cast<PrefServiceSyncable*>(profile->GetPrefs());
+}
+
+PrefServiceSyncable* PrefServiceSyncableIncognitoFromProfile(Profile* profile) {
+  return static_cast<PrefServiceSyncable*>(profile->GetOffTheRecordPrefs());
+}