Cleanup: Remove unneeded includes of pref_names.h

chrome/browser/extensions/extension_host.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.
 
 #include "chrome/browser/extensions/extension_host.h"
 
 #include <list>
 
 #include "app/keyboard_codes.h"
 #include "app/l10n_util.h"
@@ skipping 25 matching lines @@
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/tab_contents/tab_contents_view.h"
 #include "chrome/browser/themes/browser_theme_provider.h"
 #include "chrome/browser/ui/app_modal_dialogs/message_box_handler.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/bindings_policy.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/native_web_keyboard_event.h"
 #include "chrome/common/notification_service.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/render_messages_params.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/common/view_types.h"
 #include "grit/browser_resources.h"
 #include "grit/generated_resources.h"
 #include "webkit/glue/context_menu.h"
 
 #if defined(TOOLKIT_VIEWS)
 #include "views/widget/widget.h"
@@ skipping 737 matching lines @@
     // Extensions hosted in ExternalTabContainer objects may not have
     // an associated browser.
     Browser* browser = GetBrowser();
     if (browser)
       window_id = ExtensionTabUtil::GetWindowId(browser);
   } else if (extension_host_type_ != ViewType::EXTENSION_BACKGROUND_PAGE) {
     NOTREACHED();
   }
   return window_id;
 }