Linux: change protobuf default option to allow building

chrome/browser/policy/proto/old_generic_format.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;
 
 // This file keeps the deprecated GenericNamedValue based format for policies
 // available. It is intended to be removed (along with all code that makes
 // use of it) as soon as all server-side components (CPanel, D3) have been
 // migrated to provide the new, explicitly typed format to clients.
 
 // A setting is a set of generic name value pairs.
 message GenericSetting {
   repeated GenericNamedValue named_value = 1;
@@ skipping 31 matching lines @@
 message GenericNamedValue {
   required string name = 1;
   optional GenericValue value = 2;
 }
 
 // Wrapper that contains the above. Designed to be a partial view of the
 // data the server currently delivers.
 message LegacyChromeSettingsProto {
   repeated GenericNamedValue named_value = 2;
 }