Remove InfoBarDelegate::InfoBarClosed(), delete InfoBars directly.

chrome/browser/infobars/infobar.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_INFOBARS_INFOBAR_H_
 #define CHROME_BROWSER_INFOBARS_INFOBAR_H_
 #pragma once
 
 #include <utility>
 
@@ skipping 17 matching lines @@
 typedef std::pair<InfoBarDelegate*, InfoBarDelegate*> InfoBarReplacedDetails;
 
 // TODO(pkasting): Port Mac to use this.
 #if defined(TOOLKIT_VIEWS) || defined(TOOLKIT_GTK)
 
 class InfoBarContainer;
 class InfoBarTabHelper;
 
 class InfoBar : public ui::AnimationDelegate {
  public:
+  // |InfoBar| takes the ownership of |delegate|.
   InfoBar(InfoBarTabHelper* owner, InfoBarDelegate* delegate);
   virtual ~InfoBar();
 
   // Platforms must define these.
   static const int kDefaultBarTargetHeight;
   static const int kSeparatorLineHeight;
   static const int kDefaultArrowTargetHeight;
   static const int kMaximumArrowTargetHeight;
   // The half-width (see comments on |arrow_half_width_| below) scales to its
   // default and maximum values proportionally to how the height scales to its.
@@ skipping 86 matching lines @@
   int bar_target_height_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBar);
 };
 
 #elif defined(OS_MACOSX)
 #include "chrome/browser/ui/cocoa/infobars/infobar.h"
 #endif
 
 #endif  // CHROME_BROWSER_INFOBARS_INFOBAR_H_