Move the cloud policy protobufs into the component.

components/policy/proto/device_management_local.proto

 // Copyright (c) 2011 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package enterprise_management;
 
@@ skipping 11 matching lines @@
   optional bool unmanaged = 3;
   // The PolicyFetchResponse wrapped by this message.
   optional PolicyFetchResponse cloud_policy = 4;
 }
 
 // Encapsulates a device ID and the associated device token.
 message DeviceCredentials {
   optional string device_id = 1;
   optional string device_token = 2;
 }