[Sync] Move //sync to //components/sync.

sync/protocol/managed_user_whitelist_specifics.proto

-// Copyright (c) 2014 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.
-//
-// Sync protocol datatype extension for supervised user whitelists.
-
-// Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
-// any fields in this file.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-option retain_unknown_fields = true;
-
-package sync_pb;
-
-// Properties of supervised user whitelist sync objects.
-// The fields here are a subset of the fields in an ExtensionSpecifics.
-message ManagedUserWhitelistSpecifics {
-  // Globally unique id for this whitelist that identifies it in the Web Store.
-  optional string id = 1;
-
-  // The name of the whitelist.
-  optional string name = 2;
-}