Replace ApplicationImpl::CreateApplicationConnector() with a standalone helper function.

shell/shell_apptest.cc

Index: shell/shell_apptest.cc
diff --git a/shell/shell_apptest.cc b/shell/shell_apptest.cc
index 7f64883422096caccdaf53e4c22650610c09d12a..42a55478697821b94d24db9672237b681ca84b6a 100644
--- a/shell/shell_apptest.cc
+++ b/shell/shell_apptest.cc
@@ -224,13 +224,15 @@ void TestApplicationConnector(mojo::ApplicationConnector* app_connector) {
 
 TEST_F(ShellAppTest, ApplicationConnector) {
   mojo::ApplicationConnectorPtr app_connector;
-  app_connector.Bind(application_impl()->CreateApplicationConnector());
+  app_connector.Bind(
+      mojo::CreateApplicationConnector(application_impl()->shell()));
   TestApplicationConnector(app_connector.get());
 }
 
 TEST_F(ShellAppTest, ApplicationConnectorDuplicate) {
   mojo::ApplicationConnectorPtr app_connector1;
-  app_connector1.Bind(application_impl()->CreateApplicationConnector());
+  app_connector1.Bind(
+      mojo::CreateApplicationConnector(application_impl()->shell()));
   {
     SCOPED_TRACE("app_connector1");
     TestApplicationConnector(app_connector1.get());