Linux: change protobuf default option to allow building

chrome/common/metrics/proto/profiler_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.
 //
 // Performance metrics collected via Chrome's built-in profiler.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package metrics;
 
 
 // Next tag: 4
 message ProfilerEventProto {
   // The type of this profile.
   enum ProfileType {
     UNKNOWN_PROFILE = 0;  // Unknown type (should not reach here).
     STARTUP_PROFILE = 1;  // Startup profile, logged approximately 60 seconds
                           // after launch.
@@ skipping 62 matching lines @@
       PPAPI_PLUGIN = 12;
       PPAPI_BROKER = 13;
     }
     optional ProcessType process_type = 11;
 
     // The local PID for the process within which this task was executed.
     optional uint32 process_id = 12;
   }
   repeated TrackedObject tracked_object = 3;
 }