Delete obviously unneeded forward declarations in chrome/browser/*.h.

chrome/browser/browser_main_win.h

-// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// 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.
 
 // Contains functions used by BrowserMain() that are win32-specific.
 
 #ifndef CHROME_BROWSER_BROWSER_MAIN_WIN_H_
 #define CHROME_BROWSER_BROWSER_MAIN_WIN_H_
 #pragma once
 
 class CommandLine;
-class MetricsService;
 
 // Handle uninstallation when given the appropriate the command-line switch.
 // If |chrome_still_running| is true a modal dialog will be shown asking the
 // user to close the other chrome instance.
 int DoUninstallTasks(bool chrome_still_running);
 
 // Prepares the localized strings that are going to be displayed to
 // the user if the browser process dies. These strings are stored in the
 // environment block so they are accessible in the early stages of the
 // chrome executable's lifetime.
 void PrepareRestartOnCrashEnviroment(const CommandLine &parsed_command_line);
 
 // This method handles the --hide-icons and --show-icons command line options
 // for chrome that get triggered by Windows from registry entries
 // HideIconsCommand & ShowIconsCommand. Chrome doesn't support hide icons
 // functionality so we just ask the users if they want to uninstall Chrome.
 int HandleIconsCommands(const CommandLine &parsed_command_line);
 
 // Check if there is any machine level Chrome installed on the current
 // machine. If yes and the current Chrome process is user level, we do not
 // allow the user level Chrome to run. So we notify the user and uninstall
 // user level Chrome.
 bool CheckMachineLevelInstall();
 
 #endif  // CHROME_BROWSER_BROWSER_MAIN_WIN_H_