Linux: change protobuf default option to allow building

chrome/browser/feedback/proto/dom.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 containing DOM data captured from the browser.
 // It includes the structure of the HTML document and Navigator data.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package userfeedback;
 
 // Data captured from HTMLDocument DOM object.
 message HtmlDocument {
 
   // The value of document.URL property.
   required string url = 1;
 
   // The value of document.title property.
   optional string title = 2;
@@ skipping 70 matching lines @@
 // A path in the HTML document between two elements, which are in the
 // ancestor-descendant relationship.
 message HtmlPath {
 
   // Ordered list of zero-based indices.
   // Empty path selects root element.
   // Non-negative index N selects (N+1)-th child.
   // Index -1 selects root element from frame content document.
   repeated int32 index = 1;
 };