Reland: Build Mojo apps in sub-dirs, like application packages.

mandoline/ui/omnibox/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//mojo/mojo_application_package.gni")
+import("//mojo/public/mojo_application.gni")
 
-mojo_application_package("omnibox") {
+mojo_native_application("omnibox") {
   sources = [
     "main.cc",
   ]
 
   deps = [
     ":lib",
     "//mandoline/services/navigation/public/interfaces",
     "//mojo/application/public/cpp",
     "//third_party/icu:icudata",
     "//ui/resources:ui_test_pak",
@@ skipping 18 matching lines @@
     "//mandoline/ui/aura",
     "//mandoline/ui/browser/public/interfaces",
     "//mojo/application/public/interfaces",
     "//mojo/converters/geometry",
     "//skia",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
     "//ui/gfx/geometry",
     "//ui/mojo/events:interfaces",
   ]
 }