Linux: change protobuf default option to allow building

chrome/common/metrics/proto/histogram_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.
 //
 // Histogram-collected metrics.
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
 package metrics;
 
 // Next tag: 4
 message HistogramEventProto {
   // The name of the histogram, hashed.
   optional fixed64 name_hash = 1;
 
   // The sum of all the sample values.
   // Together with the total count of the sample values, this allows us to
   // compute the average value.  The count of all sample values is just the sum
@@ skipping 16 matching lines @@
     // which allows the processing code to "vote" on what the correct range
     // should be for each bucket.  This in turn allows us to better identify and
     // discard corrupted reports.
     optional int32 bucket_index = 3;
 
     // The number of entries in this bucket.
     optional int64 count = 4;
   }
   repeated Bucket bucket = 3;
 }