Refactor SetOmahaExperimentLabel out of gcpai and into install_util.

chrome/installer/util/browser_distribution.cc

 // 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.
 //
 // This file defines a class that contains various method related to branding.
 // It provides only default implementations of these methods. Usually to add
 // specific branding, we will need to extend this class with a custom
 // implementation.
 
 #include "chrome/installer/util/browser_distribution.h"
@@ skipping 248 matching lines @@
     UserExperiment* experiment, int flavor) {
   return false;
 }
 
 void BrowserDistribution::LaunchUserExperiment(
     const FilePath& setup_path, installer::InstallStatus status,
     const Version& version, const installer::Product& product,
     bool system_level) {
 }
 
+bool BrowserDistribution::ShouldSetExperimentLabels() {
+  return false;
+}
 
 void BrowserDistribution::InactiveUserToastExperiment(int flavor,
     const string16& experiment_group,
     const installer::Product& installation,
     const FilePath& application_path) {
 }