Linux: change protobuf default option to allow building

remoting/proto/mux.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 for the mux channel that multiplexes multiple channels.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package remoting.protocol;
 
 message MultiplexPacket {
   // Channel ID. Each peer choses this value when it sends first packet to
   // the other peer. It unique identified channel this packet belongs to.
   // Channel ID is direction-specific, i.e. each channel has two IDs
   // assigned to it: one for receiving and one for sending.
   optional int32 channel_id = 1;
 
   // Channel name. The name is used to identify channels before channel ID
   // is assigned in the first message. This value must be included only
   // in the first packet for a given channel. All other packets must be
   // identified using channel ID.
   optional string channel_name = 2;
 
   optional bytes data = 3;
 }