Linux: change protobuf default option to allow building

chrome/browser/policy/proto/chrome_device_policy.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;
 
 message DevicePolicyRefreshRateProto {
   // In milliseconds.
   optional int64 device_policy_refresh_rate = 1;
 }
 
 message UserWhitelistProto {
   repeated string user_whitelist = 1;
 }
@@ skipping 216 matching lines @@
   optional DeviceReportingProto device_reporting = 12;
   optional EphemeralUsersEnabledProto ephemeral_users_enabled = 13;
   optional AppPackProto app_pack = 14;
   optional ForcedLogoutTimeoutsProto forced_logout_timeouts = 15;
   optional ScreenSaverProto login_screen_saver = 16;
   optional AutoUpdateSettingsProto auto_update_settings = 17;
   optional StartUpUrlsProto start_up_urls = 18;
   optional PinnedAppsProto pinned_apps = 19;
   optional SystemTimezoneProto system_timezone = 20;
 }