Keep all references to kInstallDate inside components/metrics/

chrome/browser/chrome_browser_field_trials.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.
 
 #include "chrome/browser/chrome_browser_field_trials.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 13 matching lines @@
 #endif
 
 ChromeBrowserFieldTrials::ChromeBrowserFieldTrials(
     const CommandLine& parsed_command_line)
     : parsed_command_line_(parsed_command_line) {
 }
 
 ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() {
 }
 
-void ChromeBrowserFieldTrials::SetupFieldTrials(PrefService* local_state) {
-  const base::Time install_time = base::Time::FromTimeT(
-      local_state->GetInt64(metrics::prefs::kInstallDate));
+void ChromeBrowserFieldTrials::SetupFieldTrials(const base::Time& install_time,
+                                                PrefService* local_state) {
   DCHECK(!install_time.is_null());
 
   // Field trials that are shared by all platforms.
   chrome_variations::SetupUniformityFieldTrials(install_time);
   InstantiateDynamicTrials();
 
 #if defined(OS_ANDROID) || defined(OS_IOS)
-  chrome::SetupMobileFieldTrials(
-      parsed_command_line_, install_time, local_state);
+  chrome::SetupMobileFieldTrials(parsed_command_line_);
 #else
   chrome::SetupDesktopFieldTrials(
-      parsed_command_line_, install_time, local_state);
+      parsed_command_line_, local_state);
 #endif
 }
 
 void ChromeBrowserFieldTrials::InstantiateDynamicTrials() {
   // Call |FindValue()| on the trials below, which may come from the server, to
   // ensure they get marked as "used" for the purposes of data reporting.
   base::FieldTrialList::FindValue("UMA-Dynamic-Binary-Uniformity-Trial");
   base::FieldTrialList::FindValue("UMA-Dynamic-Uniformity-Trial");
   base::FieldTrialList::FindValue("InstantDummy");
   base::FieldTrialList::FindValue("InstantChannel");
   base::FieldTrialList::FindValue("Test0PercentDefault");
   // The following trials are used from renderer process.
   // Mark here so they will be sync-ed.
   base::FieldTrialList::FindValue("CLD1VsCLD2");
   base::FieldTrialList::FindValue("MouseEventPreconnect");
   base::FieldTrialList::FindValue("UnauthorizedPluginInfoBar");
   // Activate the autocomplete dynamic field trials.
   OmniboxFieldTrial::ActivateDynamicTrials();
 }