Move shell interfaces into the shell.mojom namespace.

mash/wm/non_client_frame_controller.cc

Index: mash/wm/non_client_frame_controller.cc
diff --git a/mash/wm/non_client_frame_controller.cc b/mash/wm/non_client_frame_controller.cc
index bcc59016cd8831f1878dace69af233186a2ec4eb..9aafebd84bbd251d6f0d23e877025c16ffd859a8 100644
--- a/mash/wm/non_client_frame_controller.cc
+++ b/mash/wm/non_client_frame_controller.cc
@@ -90,7 +90,7 @@ class ContentWindowLayoutManager : public aura::LayoutManager {
 class WmNativeWidgetMus : public views::NativeWidgetMus {
  public:
   WmNativeWidgetMus(views::internal::NativeWidgetDelegate* delegate,
-                    mojo::Shell* shell,
+                    mojo::shell::mojom::Shell* shell,
                     mus::Window* window)
       : NativeWidgetMus(delegate,
                         shell,
@@ -168,7 +168,7 @@ class ClientViewMus : public views::ClientView {
 }  // namespace
 
 NonClientFrameController::NonClientFrameController(
-    mojo::Shell* shell,
+    mojo::shell::mojom::Shell* shell,
     mus::Window* window,
     mus::WindowManagerClient* window_manager_client)
     : widget_(new views::Widget), window_(window) {