Introduce InfoBarTabService API.

chrome/browser/ui/gtk/infobars/link_infobar_gtk.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_GTK_INFOBARS_LINK_INFOBAR_GTK_H_
 #define CHROME_BROWSER_UI_GTK_INFOBARS_LINK_INFOBAR_GTK_H_
 
 #include "base/basictypes.h"
 #include "chrome/browser/ui/gtk/infobars/infobar_gtk.h"
 #include "ui/base/gtk/gtk_signal.h"
 
 class LinkInfoBarDelegate;
+class InfoBarTabHelper;
 
 // An infobar that shows a string with an embedded link.
 class LinkInfoBarGtk : public InfoBarGtk {
  public:
   LinkInfoBarGtk(InfoBarTabHelper* owner, LinkInfoBarDelegate* delegate);
 
  private:
   virtual ~LinkInfoBarGtk();
 
   CHROMEGTK_CALLBACK_0(LinkInfoBarGtk, void, OnLinkClicked);
 
   LinkInfoBarDelegate* GetDelegate();
 
   DISALLOW_COPY_AND_ASSIGN(LinkInfoBarGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_INFOBARS_LINK_INFOBAR_GTK_H_