Keep all references to kInstallDate inside components/metrics/

chrome/browser/chrome_browser_field_trials_desktop.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/chrome_browser_field_trials_desktop.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/environment.h"
@@ skipping 100 matching lines @@
   trial->AppendGroup("5-pct", group == "5-pct" ? 100 : 0);
   trial->AppendGroup("0-pct", group == "0-pct" ? 100 : 0);
 
   // We have to call group in order to mark the experiment as active.
   trial->group();
 }
 
 }  // namespace
 
 void SetupDesktopFieldTrials(const CommandLine& parsed_command_line,
-                             const base::Time& install_time,
                              PrefService* local_state) {
   prerender::ConfigurePrerender(parsed_command_line);
   AutoLaunchChromeFieldTrial();
   OmniboxFieldTrial::ActivateStaticTrials();
   SetupInfiniteCacheFieldTrial();
   DisableShowProfileSwitcherTrialIfNecessary();
   SetupShowAppLauncherPromoFieldTrial(local_state);
   SetupPreReadFieldTrial();
 }
 
 }  // namespace chrome