Make sure that Content Handled application can be connected multiple times.

mojo/shell/external_application_listener_unittest.cc

Index: mojo/shell/external_application_listener_unittest.cc
diff --git a/mojo/shell/external_application_listener_unittest.cc b/mojo/shell/external_application_listener_unittest.cc
index 943331238b2edb6bb07de0a864af69c321951883..c69406545c0d8c8e538c95703df98dbeff35fdf6 100644
--- a/mojo/shell/external_application_listener_unittest.cc
+++ b/mojo/shell/external_application_listener_unittest.cc
@@ -33,7 +33,8 @@ class NotAnApplicationLoader : public ApplicationLoader {
 
   void Load(ApplicationManager* application_manager,
             const GURL& url,
-            scoped_refptr<LoadCallbacks> callbacks) override {
+            ScopedMessagePipeHandle shell_handle,
+            LoadCallback callback) override {
     NOTREACHED();
   }