Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/infobars/infobar.cc

 // 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.
 
 #include "chrome/browser/infobars/infobar.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 165 matching lines @@
     PlatformSpecificOnHeightsRecalculated();
 
   if (container_ && (heights_differ || force_notify))
     container_->OnInfoBarStateChanged(animation_.is_animating());
 }
 
 void InfoBar::MaybeDelete() {
   if (!owner_ && delegate_ && (animation_.GetCurrentValue() == 0.0)) {
     if (container_)
       container_->RemoveInfoBar(this);
-    delegate_->InfoBarClosed();
+    delete delegate_;
     delegate_ = NULL;
   }
 }
 
 #endif  // TOOLKIT_VIEWS || TOOLKIT_GTK