Ensure that GetBootTimes is always called, since it updates histograms

chrome/browser/chromeos/login/version_info_updater.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_VERSION_INFO_UPDATER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_VERSION_INFO_UPDATER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 44 matching lines @@
 
   // Set enterprise domain name.
   void SetEnterpriseInfo(const std::string& domain_name,
                          const std::string& status_text);
 
   // Callback from chromeos::VersionLoader giving the version.
   void OnVersion(VersionLoader::Handle handle, std::string version);
   // Callback from chromeos::InfoLoader giving the boot times.
   void OnBootTimes(
       BootTimesLoader::Handle handle, BootTimesLoader::BootTimes boot_times);
+  // Null callback from chromeos::InfoLoader.
+  void OnBootTimesNoop(
+      BootTimesLoader::Handle handle, BootTimesLoader::BootTimes boot_times);
 
   // Handles asynchronously loading the version.
   VersionLoader version_loader_;
   // Used to request the version.
   CancelableRequestConsumer version_consumer_;
 
   // Handles asynchronously loading the boot times.
   BootTimesLoader boot_times_loader_;
   // Used to request the boot times.
   CancelableRequestConsumer boot_times_consumer_;
@@ skipping 11 matching lines @@
       cloud_policy_registrar_;
 
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(VersionInfoUpdater);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_VERSION_INFO_UPDATER_H_
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