Linux: change protobuf default option to allow building

chrome/browser/policy/proto/device_management_backend.proto

 // 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.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package enterprise_management;
 
 // Request from device to server to register device.
 message DeviceRegisterRequest {
   // Reregister device without erasing server state.  It can be used
   // to refresh dmtoken etc.  Client MUST set this value to true if it
   // reuses an existing device id.
   optional bool reregister = 1;
 
   // Device register type.  This field does not exist for TT release.
@@ skipping 466 matching lines @@
 
   // Device status report response.
   optional DeviceStatusReportResponse device_status_report_response = 6;
 
   // Session status report response.
   optional SessionStatusReportResponse session_status_report_response = 7;
 
   // Auto-enrollment detection response.
   optional DeviceAutoEnrollmentResponse auto_enrollment_response = 8;
 }