Eliminate Launchable. Use Navigator instead.

mojo/examples/window_manager/window_manager.cc

Index: mojo/examples/window_manager/window_manager.cc
diff --git a/mojo/examples/window_manager/window_manager.cc b/mojo/examples/window_manager/window_manager.cc
index a96becea6e640b0c835265b296afa09e7c10eb60..52189e1bd2dfdbbfb11f39c45f200abebd766376 100644
--- a/mojo/examples/window_manager/window_manager.cc
+++ b/mojo/examples/window_manager/window_manager.cc
@@ -137,7 +137,13 @@ class WindowManager : public Application,
       size_t index = node->children().size() - 1;
       details->url = base::StringPrintf(
           "%s/%x", kEmbeddedAppURL, kColors[index % arraysize(kColors)]);
-      navigator->Navigate(embedded->id(), details.Pass());
+
+      // TODO(beng): remove once nullable parameters land.
+      navigation::ResponseDetailsPtr response_details(
+          navigation::ResponseDetails::New());
+      navigator->Navigate(embedded->id(),
+                          details.Pass(),
+                          response_details.Pass());
     }
   }