Removing Variations support for google_update_experiment_id.

components/variations/proto/study.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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package variations;
 
@@ skipping 55 matching lines @@
     required uint32 probability_weight = 2;
 
     // Optional id used to uniquely identify this experiment for Google web
     // properties.
     optional uint64 google_web_experiment_id = 3;
 
     // Optional id used to allow this experiment to trigger experimental
     // behavior on Google web properties.
     optional uint64 google_web_trigger_experiment_id = 8;
 
-    // Optional id used to uniquely identify this experiment for Google Update.
-    optional uint64 google_update_experiment_id = 4;
-
     // Optional id used to uniquely identify this experiment for Chrome Sync.
     optional uint64 chrome_sync_experiment_id = 10;
 
     // Specifies the feature association parameters for this experiment group.
     //
     // Next tag: 5
     message FeatureAssociation {
       // Optional list of features to enable when this experiment is selected.
       // Command-line overrides take precedence over this setting. No feature
       // listed here should exist in the |disable_feature| list.
@@ skipping 200 matching lines @@
     // This is recommended for most studies that include client code.
     ACTIVATION_EXPLICIT  = 0;
     // The study will be automatically activated when it is created. This
     // is recommended for studies that do not have any client logic.
     ACTIVATION_AUTO      = 1;
   }
 
   // Activation type for this study. Defaults to ACTIVATION_EXPLICIT if omitted.
   optional ActivationType activation_type = 12;
 }