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

chrome/browser/ui/cocoa/infobars/infobar_controller.mm

Index: chrome/browser/ui/cocoa/infobars/infobar_controller.mm
diff --git a/chrome/browser/ui/cocoa/infobars/infobar_controller.mm b/chrome/browser/ui/cocoa/infobars/infobar_controller.mm
index c81a3635a3c36d10e05ffff98d066efd89c39fad..e7825bbb09a93fb0beecbc7136c8f2590a9ee872 100644
--- a/chrome/browser/ui/cocoa/infobars/infobar_controller.mm
+++ b/chrome/browser/ui/cocoa/infobars/infobar_controller.mm
@@ -236,10 +236,9 @@ const float kAnimateCloseDuration = 0.12;
   if (!infoBarClosing_)
     return;
 
-  // Notify the delegate that the infobar was closed.  The delegate will delete
-  // itself as a result of InfoBarClosed(), so we null out its pointer.
+  // Notify the delegate that the infobar was closed.
   if (delegate_) {
-    delegate_->InfoBarClosed();
+    delete delegate_;
     delegate_ = NULL;
   }