Move shell service to toplevel shell namespace

ui/views/mus/window_tree_host_mus.h

Index: ui/views/mus/window_tree_host_mus.h
diff --git a/ui/views/mus/window_tree_host_mus.h b/ui/views/mus/window_tree_host_mus.h
index 546a3ac23b8fb120022f0c75c97681cdc1ca59c1..bc678752ef238f14f67c5122ad7b811cf31fb4fd 100644
--- a/ui/views/mus/window_tree_host_mus.h
+++ b/ui/views/mus/window_tree_host_mus.h
@@ -11,14 +11,14 @@
 
 class SkBitmap;
 
-namespace mojo {
-class Connector;
-}
-
 namespace mus {
 class Window;
 }
 
+namespace shell {
+class Connector;
+}
+
 namespace views {
 
 class InputMethodMUS;
@@ -27,7 +27,7 @@ class PlatformWindowMus;
 
 class VIEWS_MUS_EXPORT WindowTreeHostMus : public aura::WindowTreeHostPlatform {
  public:
-  WindowTreeHostMus(mojo::Connector* connector,
+  WindowTreeHostMus(shell::Connector* connector,
                     NativeWidgetMus* native_widget,
                     mus::Window* window);
   ~WindowTreeHostMus() override;