Add DeviceSettingProvider unit tests.

chrome/browser/ui/options/options_util.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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/ui/options/options_util.h"
 
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/metrics/metrics_service.h"
 #include "chrome/installer/util/google_update_settings.h"
 
 // static
 bool OptionsUtil::ResolveMetricsReportingEnabled(bool enabled) {
   // GoogleUpdateSettings touches the disk from the UI thread. MetricsService
   // also calls GoogleUpdateSettings below. http://crbug/62626
   base::ThreadRestrictions::ScopedAllowIO allow_io;
 
   GoogleUpdateSettings::SetCollectStatsConsent(enabled);
   bool update_pref = GoogleUpdateSettings::GetCollectStatsConsent();
 
   if (enabled != update_pref)
     DVLOG(1) << "OptionsUtil: Unable to set crash report status to " << enabled;
 
   // Only change the pref if GoogleUpdateSettings::GetCollectStatsConsent
   // succeeds.
   enabled = update_pref;
 
   MetricsService* metrics = g_browser_process->metrics_service();
-  DCHECK(metrics);
   if (metrics) {
     if (enabled)
       metrics->Start();
     else
       metrics->Stop();
   }
 
   return enabled;
 }