Linux: change protobuf default option to allow building

chrome/common/metrics/proto/omnibox_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 omnibox interaction.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package metrics;
 
 // Next tag: 13
 message OmniboxEventProto {
   // The timestamp for the event, in seconds since the epoch.
   optional int64 time = 1;
 
   // The id of the originating tab for this omnibox interaction.
   // This is the current tab *unless* the user opened the target in a new tab.
   // In those cases, this is unset.  Tab ids are unique for a given session_id
@@ skipping 122 matching lines @@
 
     // The provider's done() value, i.e., whether it's completed processing
     // the query.  Providers which don't do any asynchronous processing
     // will always be done.
     optional bool provider_done = 2;
   }
   // A list of diagnostic information about each provider.  Providers
   // will appear at most once in this list.
   repeated ProviderInfo provider_info = 12;
 }