Simplify infobar expiry.

components/infobars/core/confirm_infobar_delegate.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 COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_H_
 #define COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "components/infobars/core/infobar_delegate.h"
@@ skipping 50 matching lines @@
   // Called when the Link (if any) is clicked. The |disposition| specifies how
   // the resulting document should be loaded (based on the event flags present
   // when the link was clicked). If this function returns true, the infobar is
   // then immediately closed. Subclasses MUST NOT return true if in handling
   // this call something triggers the infobar to begin closing.
   virtual bool LinkClicked(WindowOpenDisposition disposition);
 
  protected:
   ConfirmInfoBarDelegate();
 
-  bool ShouldExpireInternal(const NavigationDetails& details) const override;
-
  private:
   // InfoBarDelegate:
   bool EqualsDelegate(infobars::InfoBarDelegate* delegate) const override;
   ConfirmInfoBarDelegate* AsConfirmInfoBarDelegate() override;
 
   DISALLOW_COPY_AND_ASSIGN(ConfirmInfoBarDelegate);
 };
 
 #endif  // COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_H_