Remove some unused headers from metrics_service.cc.

chrome/browser/metrics/metrics_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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It is
@@ skipping 178 matching lines @@
 #include "chrome/browser/metrics/metrics_log.h"
 #include "chrome/browser/metrics/metrics_log_serializer.h"
 #include "chrome/browser/metrics/metrics_reporting_scheduler.h"
 #include "chrome/browser/metrics/metrics_state_manager.h"
 #include "chrome/browser/metrics/time_ticks_experiment_win.h"
 #include "chrome/browser/metrics/tracking_synchronizer.h"
 #include "chrome/common/metrics/variations/variations_util.h"
 #include "chrome/browser/net/http_pipelining_compatibility_client.h"
 #include "chrome/browser/net/network_stats.h"
 #include "chrome/browser/omnibox/omnibox_log.h"
-#include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_otr_state.h"
-#include "chrome/browser/ui/search/search_tab_helper.h"
 #include "chrome/common/chrome_constants.h"
-#include "chrome/common/chrome_result_codes.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/crash_keys.h"
 #include "chrome/common/net/test_server_locations.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "components/metrics/metrics_log_manager.h"
 #include "components/variations/entropy_provider.h"
 #include "components/variations/metrics_util.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/histogram_fetcher.h"
@@ skipping 1716 matching lines @@
   // Android has its own settings for metrics / crash uploading.
   const PrefService* prefs = g_browser_process->local_state();
   return prefs->GetBoolean(prefs::kCrashReportingEnabled);
 #else
   return MetricsServiceHelper::IsMetricsReportingEnabled();
 #endif
 #else
   return false;
 #endif
 }