Make TabContents own its infobar delegates....

chrome/browser/gtk/infobar_gtk.h

Index: chrome/browser/gtk/infobar_gtk.h
===================================================================
--- chrome/browser/gtk/infobar_gtk.h	(revision 65558)
+++ chrome/browser/gtk/infobar_gtk.h	(working copy)
@@ -21,7 +21,6 @@
 class CustomDrawButton;
 class GtkThemeProvider;
 class InfoBarContainerGtk;
-class InfoBarDelegate;
 
 class InfoBar : public SlideAnimatorGtk::Delegate,
                 public NotificationObserver,
@@ -139,6 +138,11 @@
 
   void UpdateBorderColor();
 
+  // We cache |delegate_->GetInfoBarType()| for use in OnBackgroundExpose()
+  // since that may be called when there's no longer a delegate (e.g. during
+  // AnimateClose()).
+  InfoBarDelegate::Type cached_infobar_type_;
+
   DISALLOW_COPY_AND_ASSIGN(InfoBar);
 };