Introduce mash/shell

mash/example/main/main_application_delegate.cc

Index: mash/example/main/main_application_delegate.cc
diff --git a/mash/example/main/main_application_delegate.cc b/mash/example/main/main_application_delegate.cc
index 3ac499aa5f7d426dff003476daeb4734079ba753..3fc15ce433a68058f665cb14fcc57f80870c132a 100644
--- a/mash/example/main/main_application_delegate.cc
+++ b/mash/example/main/main_application_delegate.cc
@@ -12,8 +12,7 @@ MainApplicationDelegate::MainApplicationDelegate() {}
 MainApplicationDelegate::~MainApplicationDelegate() {}
 
 void MainApplicationDelegate::Initialize(mojo::ApplicationImpl* app) {
-  connections_.push_back(app->ConnectToApplication("mojo:mash_wm"));
-  connections_.push_back(app->ConnectToApplication("mojo:mock_sysui"));
+  connections_.push_back(app->ConnectToApplication("mojo:mash_shell"));
   connections_.push_back(app->ConnectToApplication("mojo:views_examples"));
   connections_.push_back(
       app->ConnectToApplication("exe:window_type_launcher_exe"));