Make infobars ignore button clicks when closing.

chrome/browser/ui/gtk/infobars/infobar_gtk.cc

Index: chrome/browser/ui/gtk/infobars/infobar_gtk.cc
===================================================================
--- chrome/browser/ui/gtk/infobars/infobar_gtk.cc	(revision 102206)
+++ chrome/browser/ui/gtk/infobars/infobar_gtk.cc	(working copy)
@@ -184,10 +184,9 @@
 }
 
 void InfoBarGtk::OnCloseButton(GtkWidget* button) {
-  // If we're not owned, we're already closing, so don't call
-  // InfoBarDismissed(), since this can lead to us double-recording dismissals.
-  if (delegate() && owned())
-    delegate()->InfoBarDismissed();
+  if (!owned())
+    return;  // We're closing; don't call anything, it might access the owner.
+  delegate()->InfoBarDismissed();
   RemoveSelf();
 }