Build Mojo apps in subdirectories, like application packages.

mandoline/ui/browser/BUILD.gn

Index: mandoline/ui/browser/BUILD.gn
diff --git a/mandoline/ui/browser/BUILD.gn b/mandoline/ui/browser/BUILD.gn
index 8bdb7c2573abf972dccc53f99fd80b579d16c149..c46d388586c4ad88097da65d0c329122f9b79924 100644
--- a/mandoline/ui/browser/BUILD.gn
+++ b/mandoline/ui/browser/BUILD.gn
@@ -3,10 +3,10 @@
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
-import("//mojo/mojo_application_package.gni")
+import("//mojo/public/mojo_application.gni")
 import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 
-mojo_application_package("browser") {
+mojo_native_application("browser") {
   sources = [
     "main.cc",
   ]
@@ -18,6 +18,7 @@ mojo_application_package("browser") {
     "//third_party/icu:icudata",
     "//ui/resources:ui_test_pak",
   ]
+
   resources = [
     "$root_out_dir/icudtl.dat",
     "$root_out_dir/ui_test.pak",