Refactor SetOmahaExperimentLabel out of gcpai and into install_util.

chrome/installer/util/google_chrome_distribution.h

 // 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 extends generic BrowserDistribution class to declare Google Chrome
 // specific implementation.
 
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_
 
@@ skipping 87 matching lines @@
 
   // Assuming that the user qualifies, this function performs the inactive user
   // toast experiment. It will use chrome to show the UI and it will record the
   // outcome in the registry.
   virtual void InactiveUserToastExperiment(
       int flavor,
       const string16& experiment_group,
       const installer::Product& installation,
       const FilePath& application_path) OVERRIDE;
 
+  virtual bool ShouldWriteExperimentLabels() const OVERRIDE;
+
   const string16& product_guid() { return product_guid_; }
 
  protected:
   void set_product_guid(const string16& guid) { product_guid_ = guid; }
 
   // Disallow construction from others.
   GoogleChromeDistribution();
 
  private:
   friend class BrowserDistribution;
@@ skipping 17 matching lines @@
   // Returns true if at least one uninstall metric was found in
   // uninstall_metrics_dict, false otherwise.
   virtual bool BuildUninstallMetricsString(
       const base::DictionaryValue* uninstall_metrics_dict, string16* metrics);
 
   // The product ID for Google Update.
   string16 product_guid_;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_