base/ header cleanup. Forward declaration instead of including.

chrome/browser/metrics/metrics_service.cc

 // Copyright (c) 2010 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
@@ skipping 146 matching lines @@
 //------------------------------------------------------------------------------
 
 #include "chrome/browser/metrics/metrics_service.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <objbase.h>
 #endif
 
 #include "base/base64.h"
+#include "base/command_line.h"
 #include "base/histogram.h"
 #include "base/md5.h"
 #include "base/thread.h"
 #include "base/values.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/load_notification_details.h"
 #include "chrome/browser/memory_details.h"
 #include "chrome/browser/metrics/histogram_synchronizer.h"
@@ skipping 1773 matching lines @@
     hardware_class = kUnknownHardwareClass;
   }
   return hardware_class;
 }
 
 void MetricsService::StartExternalMetrics() {
   external_metrics_ = new chromeos::ExternalMetrics;
   external_metrics_->Start();
 }
 #endif