Turn 'browser' app into a 'launcher_ui' app that window_manager embeds.

mojo/mojo_services.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_echo_bindings',
       'type': 'static_library',
       'sources': [
         'services/dbus_echo/echo.mojom',
       ],
       'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
       'export_dependent_settings': [
@@ skipping 241 matching lines @@
       'sources': [
         'services/public/interfaces/launcher/launcher.mojom',
       ],
       'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
       'export_dependent_settings': [
         'mojo_cpp_bindings',
       ],
       'dependencies': [
         'mojo_cpp_bindings',
         'mojo_network_bindings',
-        'mojo_navigation_bindings',
       ],
     },
     {
       'target_name': 'mojo_launcher',
       'type': 'shared_library',
       'dependencies': [
         '../base/base.gyp:base',
         'mojo_application',
         'mojo_cpp_bindings',
         'mojo_environment_chromium',
@@ skipping 270 matching lines @@
             'mojo_system_impl',
           ],
           'sources': [
             'services/dbus_echo/dbus_echo_service.cc',
           ],
         },
       ],
     }],
   ],
 }