Update PasswordManagerBrowserTest to use the new Observer class from InfoBarManager.

chrome/browser/infobars/infobar_manager.h

 // Copyright 2014 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_MANAGER_H_
 #define CHROME_BROWSER_INFOBARS_INFOBAR_MANAGER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "chrome/browser/infobars/infobar_delegate.h"
 
 namespace content {
 class WebContents;
 }
 
 class InfoBar;
 
 // Provides access to creating, removing and enumerating info bars
 // attached to a tab.
 class InfoBarManager {
  public:
   // Observer class for infobar events.
   class Observer {
    public:
-    virtual void OnInfoBarAdded(InfoBar* infobar) = 0;
-    virtual void OnInfoBarRemoved(InfoBar* infobar, bool animate) = 0;
+    virtual ~Observer() {}

[Ilya Sherman, 2014/04/19 19:46:04]

nit: I don't think you need to explicitly define this.

[tfarina, 2014/04/19 22:03:23]

Done.

+
+    virtual void OnInfoBarAdded(InfoBar* infobar) {}
+    virtual void OnInfoBarRemoved(InfoBar* infobar, bool animate) {}
     virtual void OnInfoBarReplaced(InfoBar* old_infobar,
-                                   InfoBar* new_infobar) = 0;
-    virtual void OnManagerShuttingDown(InfoBarManager* manager) = 0;
+                                   InfoBar* new_infobar) {}
+    virtual void OnManagerShuttingDown(InfoBarManager* manager) {}
   };
 
   InfoBarManager();
   virtual ~InfoBarManager();
 
   // Must be called before destruction.
   // TODO(droger): Merge this method with the destructor once the virtual calls
   // for notifications are removed (see http://crbug.com/354380).
   void ShutDown();
 
@@ skipping 69 matching lines @@
 
   InfoBars infobars_;
   bool infobars_enabled_;
 
   ObserverList<Observer, true> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarManager);
 };
 
 #endif  // CHROME_BROWSER_INFOBARS_INFOBAR_MANAGER_H_