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

chrome/common/safe_browsing/client_model.proto

 // Copyright (c) 2011 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.
 //
 // This proto represents a machine learning model which is used to compute
 // the probability that a particular page visited by Chrome is phishing.
 //
 // Note: sine the machine learning model is trained on the server-side and then
 // downloaded onto the client it is important that this proto file stays in
 // sync with the server-side copy.  Otherwise, the client may not be able to
 // parse the server generated model anymore.  If you want to change this
 // protocol definition or you have questions regarding its format please contact
 // chrome-anti-phishing@googlegroups.com.
 
 syntax = "proto2";
 
+option optimize_for = LITE_RUNTIME;
+
 package safe_browsing;
 
 // This protocol buffer represents a machine learning model that is used in
 // client-side phishing detection (in Chrome).  The client extracts a set
 // of features from every website the user visits.  Extracted features map
 // feature names to floating point values (e.g., PageSecureLinksFreq -> 0.9).
 //
 // To compute the phishing score (i.e., the probability that the website is
 // phishing) a scorer will simply compute the sum of all rule scores for a
 // given set of extracted features.  The score of a particular rule corresponds
@@ skipping 53 matching lines @@
     required bytes prefix = 1;
 
     // Network prefix size in bits.  Default is an exact-host match.
     optional int32 size = 2 [default = 128];
   };
   repeated IPSubnet bad_subnet = 7;
 
   // Murmur hash seed that was used to hash the page words.
   optional fixed32 murmur_hash_seed = 8;
 }