mac: Prepare for -Wunused-functions.

chrome/browser/metrics/variations/variations_service.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/metrics/variations/variations_service.h"
 
 #include <set>
 
 #include "base/base64.h"
 #include "base/build_time.h"
@@ skipping 90 matching lines @@
   return "android";
 #elif defined(OS_LINUX) || defined(OS_BSD) || defined(OS_SOLARIS)
   // Default BSD and SOLARIS to Linux to not break those builds, although these
   // platforms are not officially supported by Chrome.
   return "linux";
 #else
 #error Unknown platform
 #endif
 }
 
-// Converts |date_time| in Study date format to base::Time.
-base::Time ConvertStudyDateToBaseTime(int64 date_time) {
-  return base::Time::UnixEpoch() + base::TimeDelta::FromSeconds(date_time);
-}
-
 // Gets the restrict parameter from |local_state| or from Chrome OS settings in
 // the case of that platform.
 std::string GetRestrictParameterPref(PrefService* local_state) {
   std::string parameter;
 #if defined(OS_CHROMEOS)
   chromeos::CrosSettings::Get()->GetString(
       chromeos::kVariationsRestrictParameter, &parameter);
 #else
   if (local_state)
     parameter = local_state->GetString(prefs::kVariationsRestrictParameter);
@@ skipping 368 matching lines @@
 
 void VariationsService::RecordLastFetchTime() {
   // local_state_ is NULL in tests, so check it first.
   if (local_state_) {
     local_state_->SetInt64(prefs::kVariationsLastFetchTime,
                            base::Time::Now().ToInternalValue());
   }
 }
 
 }  // namespace chrome_variations