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

chrome/common/metrics/proto/user_action_event.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.
 //
 // Stores information about an event that occurs in response to a user action,
 // e.g. an interaction with a browser UI element.
 
 syntax = "proto2";
 
+option optimize_for = LITE_RUNTIME;
+
 package metrics;
 
 // Next tag: 3
 message UserActionEventProto {
   // The name of the action, hashed.
   optional fixed64 name_hash = 1;
 
   // The timestamp for the event, in seconds since the epoch.
   optional int64 time = 2;
 }