Remove shell::Connection* parameter to InterfaceFactory<T>::Create()

mash/webtest/webtest.cc

Index: mash/webtest/webtest.cc
diff --git a/mash/webtest/webtest.cc b/mash/webtest/webtest.cc
index 6a691d041fbd3df2d6aeaa5a40a164477bf8476a..835fac25c598d972e0aee4f44bbf94156bd8f5ed 100644
--- a/mash/webtest/webtest.cc
+++ b/mash/webtest/webtest.cc
@@ -196,7 +196,7 @@ void Webtest::Launch(uint32_t what, mojom::LaunchMode how) {
   AddWindow(window);
 }
 
-void Webtest::Create(shell::Connection* connection,
+void Webtest::Create(const shell::Identity& remote_identity,
                      mojom::LaunchableRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }