Panels refactor: Support browserless panels on Linux.

chrome/browser/ui/panels/panel_host.h

 // Copyright (c) 2012 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_PANELS_PANEL_HOST_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_HOST_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/page_zoom.h"
 
 class FaviconTabHelper;
 class GURL;
 class Panel;
+class PrefsTabHelper;
 class Profile;
 
 namespace content {
 class WebContents;
 }
 
 namespace extensions {
 class WindowController;
 }
 
@@ skipping 62 matching lines @@
   // Message handlers.
   void OnRequest(const ExtensionHostMsg_Request_Params& params);
 
   Panel* panel_;  // Weak, owns us.
   Profile* profile_;
   ExtensionFunctionDispatcher extension_function_dispatcher_;
 
   // The following factory is used to close the panel via the message loop.
   base::WeakPtrFactory<PanelHost> weak_factory_;
 
+  scoped_ptr<PrefsTabHelper> prefs_tab_helper_;
   scoped_ptr<FaviconTabHelper> favicon_tab_helper_;
   scoped_ptr<content::WebContents> web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelHost);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_HOST_H_