Linux: change protobuf default option to allow building

remoting/proto/video.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 video messages.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package remoting;
 
 message VideoPacketFormat {
   // Identifies how the image was encoded.
   enum Encoding {
     ENCODING_INVALID = -1;
     ENCODING_VERBATIM = 0;
     ENCODING_ZLIB = 1;
     ENCODING_VP8 = 2;
   };
@@ skipping 72 matching lines @@
   // Time in milliseconds spent in capturing this video frame.
   optional int32 capture_time_ms = 7;
 
   // Time in milliseconds spent in encoding this video frame.
   optional int32 encode_time_ms = 8;
 
   // The most recent sequence number received from the client on the event
   // channel.
   optional int64 client_sequence_number = 9;
 }