Linux: change protobuf default option to allow building

chrome/browser/feedback/proto/extension.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.
 
 // Messages sent from extension to feedback server as JSON.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package userfeedback;
 
 import "common.proto";
 import "chrome.proto";
 import "dom.proto";
 import "math.proto";
 import "web.proto";
 
 // Sent along with request for extension page when user attempts to open
 // feedback tab.
@@ skipping 51 matching lines @@
   required CommonData common_data = 1;
 
   required WebData web_data = 2;
 
   required int32 type_id = 3;
 
   optional HtmlDocument html_document_structure = 4;
 
   optional ChromeData chrome_data = 5;
 };