Linux: change protobuf default option to allow building

chrome/browser/chromeos/contacts/contact.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.
 //
 // Protocol buffer definitions for the user's contacts.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package contacts;
 
 // A contact, roughly based on the GData Contact kind:
 // https://developers.google.com/gdata/docs/2.0/elements#gdContactKind
 // All strings are UTF-8 with Unicode byte order marks stripped out.
 message Contact {
   // Next ID to use: 16
 
   // Provider-assigned unique identifier.
   optional string contact_id = 1;
@@ skipping 86 matching lines @@
   // Next ID to use: 3
 
   // Time at which the last successful update was started, as given by
   // base::Time::ToInternalValue().
   optional int64 last_update_start_time = 1;
 
   // Latest time that we've seen in a contact's |update_time| field.  Note that
   // the time may have come from a deleted contact that has been discarded.
   optional int64 last_contact_update_time = 2;
 }