Properly Remove Autofill Keyboard Listener.

chrome/browser/autofill/autofill_external_delegate.h

Index: chrome/browser/autofill/autofill_external_delegate.h
diff --git a/chrome/browser/autofill/autofill_external_delegate.h b/chrome/browser/autofill/autofill_external_delegate.h
index 692f3d71301be13a237563c86024e78c99ad0e20..70ee882d4df9a6d163109cb6e47eafcc2c2abfff 100644
--- a/chrome/browser/autofill/autofill_external_delegate.h
+++ b/chrome/browser/autofill/autofill_external_delegate.h
@@ -186,6 +186,10 @@ class AutofillExternalDelegate
   // currently editing?  Used to keep track of state for metrics logging.
   bool has_shown_autofill_popup_for_current_edit_;
 
+  // The RenderViewHost that this object has been registered with as a
+  // keyboard listener.
+  content::RenderViewHost* registered_keyboard_listener_with_;
+
   // The current data list values.
   std::vector<string16> data_list_values_;
   std::vector<string16> data_list_labels_;