Move shell service to toplevel shell namespace

ash/mus/keyboard_ui_mus.cc

Index: ash/mus/keyboard_ui_mus.cc
diff --git a/ash/mus/keyboard_ui_mus.cc b/ash/mus/keyboard_ui_mus.cc
index 3e67fa797feb7b0dd98f0896c7b3b3cfb8688edf..d2ca388071fc2d19d8188acbdaee46086080ce43 100644
--- a/ash/mus/keyboard_ui_mus.cc
+++ b/ash/mus/keyboard_ui_mus.cc
@@ -12,7 +12,7 @@
 
 namespace ash {
 
-KeyboardUIMus::KeyboardUIMus(mojo::Connector* connector)
+KeyboardUIMus::KeyboardUIMus(::shell::Connector* connector)
     : is_enabled_(false), observer_binding_(this) {
   // TODO(sky): should be something like mojo:keyboard, but need mapping.
   connector->ConnectToInterface("exe:chrome", &keyboard_);
@@ -22,7 +22,8 @@ KeyboardUIMus::KeyboardUIMus(mojo::Connector* connector)
 KeyboardUIMus::~KeyboardUIMus() {}
 
 // static
-std::unique_ptr<KeyboardUI> KeyboardUIMus::Create(mojo::Connector* connector) {
+std::unique_ptr<KeyboardUI> KeyboardUIMus::Create(
+    ::shell::Connector* connector) {
   return base::WrapUnique(new KeyboardUIMus(connector));
 }