Move shell service to toplevel shell namespace

ui/views/mus/window_manager_connection.h

Index: ui/views/mus/window_manager_connection.h
diff --git a/ui/views/mus/window_manager_connection.h b/ui/views/mus/window_manager_connection.h
index 271691978b4aa6a8c86bd1a49596c6863b8b1fc1..469f7e6848562d8dc630c0643158876742af9831 100644
--- a/ui/views/mus/window_manager_connection.h
+++ b/ui/views/mus/window_manager_connection.h
@@ -15,7 +15,7 @@
 #include "ui/views/mus/screen_mus_delegate.h"
 #include "ui/views/widget/widget.h"
 
-namespace mojo {
+namespace shell {
 class Connector;
 }
 
@@ -38,14 +38,14 @@ class VIEWS_MUS_EXPORT WindowManagerConnection
     : public NON_EXPORTED_BASE(mus::WindowTreeDelegate),
       public ScreenMusDelegate {
  public:
-  static void Create(mojo::Connector* connector);
+  static void Create(shell::Connector* connector);
   static WindowManagerConnection* Get();
   static bool Exists();
 
   // Destroys the singleton instance.
   static void Reset();
 
-  mojo::Connector* connector() { return connector_; }
+  shell::Connector* connector() { return connector_; }
 
   mus::Window* NewWindow(const std::map<std::string,
                          std::vector<uint8_t>>& properties);
@@ -56,7 +56,7 @@ class VIEWS_MUS_EXPORT WindowManagerConnection
       internal::NativeWidgetDelegate* delegate);
 
  private:
-  explicit WindowManagerConnection(mojo::Connector* connector);
+  explicit WindowManagerConnection(shell::Connector* connector);
   ~WindowManagerConnection() override;
 
   // mus::WindowTreeDelegate:
@@ -66,7 +66,7 @@ class VIEWS_MUS_EXPORT WindowManagerConnection
   // ScreenMusDelegate:
   void OnWindowManagerFrameValuesChanged() override;
 
-  mojo::Connector* connector_;
+  shell::Connector* connector_;
   std::unique_ptr<ScreenMus> screen_;
   std::unique_ptr<mus::WindowTreeConnection> window_tree_connection_;