browser: Abstract message box dialog functions into its own header file.

chrome/browser/ui/views/about_chrome_view.cc

 // Copyright (c) 2011 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/views/about_chrome_view.h"
 
 #if defined(OS_WIN)
 #include <commdlg.h>
 #endif  // defined(OS_WIN)
 
 #include <algorithm>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/i18n/rtl.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/windows_version.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/prefs/pref_service.h"
-#include "chrome/browser/platform_util.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/views/window.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "content/browser/user_metrics.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
@@ skipping 700 matching lines @@
   // We have updated controls on the parent, so we need to update its layout.
   parent()->Layout();
 
   // Check button may have appeared/disappeared. We cannot call this during
   // ViewHierarchyChanged because the view hasn't been added to a Widget yet.
   if (GetWidget())
     GetDialogClientView()->UpdateDialogButtons();
 }
 
 #endif