Introduce //components/user_prefs, use to eliminate c/b/prefs dependency in Autofill.

components/user_prefs/pref_registry_syncable.cc

 // 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.
 
-#include "chrome/browser/prefs/pref_registry_syncable.h"
+#include "components/user_prefs/pref_registry_syncable.h"
 
 #include "base/files/file_path.h"
 #include "base/prefs/default_pref_store.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
 // A helper function for RegisterLocalized*Pref that creates a Value*
@@ skipping 195 matching lines @@
 }
 
 scoped_refptr<PrefRegistrySyncable> PrefRegistrySyncable::ForkForIncognito() {
   // TODO(joi): We can directly reuse the same PrefRegistry once
   // PrefService no longer registers for callbacks on registration and
   // unregistration.
   scoped_refptr<PrefRegistrySyncable> registry(new PrefRegistrySyncable());
   registry->defaults_ = defaults_;
   return registry;
 }