Cleanup: Remove unneeded forward declarations from chrome/browser/ui/webui.

chrome/browser/ui/webui/options/extension_settings_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_EXTENSION_SETTINGS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_EXTENSION_SETTINGS_HANDLER_H_
 #pragma once
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_uninstall_dialog.h"
 #include "chrome/browser/extensions/extension_warning_set.h"
 #include "chrome/browser/ui/shell_dialogs.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 #include "chrome/browser/ui/webui/chrome_web_ui.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "googleurl/src/gurl.h"
 
 class Extension;
 class ExtensionService;
 class FilePath;
 class PrefService;
-class RenderProcessHost;
 class UserScript;
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 // Information about a page running in an extension, for example a popup bubble,
 // a background page, or a tab contents.
 struct ExtensionPage {
@@ skipping 153 matching lines @@
   // We want to register for notifications only after we've responded at least
   // once to the page, otherwise we'd be calling javacsript functions on objects
   // that don't exist yet when notifications come in. This variable makes sure
   // we do so only once.
   bool registered_for_notifications_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_EXTENSION_SETTINGS_HANDLER_H_