Revert "Linux: change protobuf default option to allow building"

chrome/browser/feedback/proto/math.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 common math data structures.
 
 syntax = "proto2";
 
+option optimize_for = LITE_RUNTIME;
+
 package userfeedback;
 
 // 2D Dimensions.
 message Dimensions {
   required float width = 1;
   required float height = 2;
 };
 
 // Axis-aligned rectangle in 2D space.
 message Rectangle {
   required float left = 1;
   required float top = 2;
   required float width = 3;
   required float height = 4;
 };