Keep all references to kInstallDate inside components/metrics/

chrome/browser/chrome_browser_field_trials_mobile.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_mobile.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 54 matching lines @@
   // independently from the rollout of compression proxy. The enabled
   // percentage is configured to be 10% = 100 / 1000 until overridden by the
   // server. When this trial is "Enabled," users get a promo, whereas
   // otherwise, compression is available without a promo.
   DataCompressionProxyBaseFieldTrial(
       "DataCompressionProxyPromoVisibility", 100, 1000);
 }
 
 }  // namespace
 
-void SetupMobileFieldTrials(const CommandLine& parsed_command_line,
-                            const base::Time& install_time,
-                            PrefService* local_state) {
+void SetupMobileFieldTrials(const CommandLine& parsed_command_line) {
   DataCompressionProxyFieldTrials();
 #if defined(OS_ANDROID)
   prerender::ConfigurePrerender(parsed_command_line);
 #endif
 }
 
 }  // namespace chrome