Fix animation bug in ExtensionInfoBar would can result in orphaned instances in the view hierarchy

chrome/browser/extensions/extension_infobar_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INFOBAR_DELEGATE_H_
 
 #include "chrome/browser/tab_contents/infobar_delegate.h"
 
 class Browser;
@@ skipping 15 matching lines @@
   ExtensionInfoBarDelegate(Browser* browser, TabContents* contents,
                            Extension* extension, const GURL& url);
   ~ExtensionInfoBarDelegate();
 
   Extension* extension() { return extension_; }
   ExtensionHost* extension_host() { return extension_host_.get(); }
 
   void set_observer(DelegateObserver* observer) { observer_ = observer; }
 
   // Overridden from InfoBarDelegate:
+  virtual void InfoBarDismissed() { closing_ = true; }
   virtual bool EqualsDelegate(InfoBarDelegate* delegate) const;
   virtual void InfoBarClosed();
   virtual InfoBar* CreateInfoBar();
   virtual ExtensionInfoBarDelegate* AsExtensionInfoBarDelegate() {
     return this;
   }
   virtual Type GetInfoBarType() {
     return PAGE_ACTION_TYPE;
   }
 
   // Overridden from NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
+  bool closing() { return closing_; }
  private:
   // The extension host we are showing the InfoBar for. The delegate needs to
   // own this since the InfoBar gets deleted and recreated when you switch tabs
   // and come back (and we don't want the user's interaction with the InfoBar to
   // get lost at that point.
   scoped_ptr<ExtensionHost> extension_host_;
 
   // The observer monitoring when the delegate dies.
   DelegateObserver* observer_;
 
   Extension* extension_;
 
   TabContents* tab_contents_;
 
   NotificationRegistrar registrar_;
 
+  // Whether we are currently animating to close. This is used to ignore
+  // ExtensionView::PreferredSizeChanged notifications.
+  bool closing_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INFOBAR_DELEGATE_H_