Move shell service to toplevel shell namespace

components/font_service/font_service_app.h

Index: components/font_service/font_service_app.h
diff --git a/components/font_service/font_service_app.h b/components/font_service/font_service_app.h
index da892696bba79fa25d0262546926e30d54b563e5..53a3b0b4ea5d7c31f7ece2ca443a0a71ef01408a 100644
--- a/components/font_service/font_service_app.h
+++ b/components/font_service/font_service_app.h
@@ -18,21 +18,22 @@
 
 namespace font_service {
 
-class FontServiceApp : public mojo::ShellClient,
-                       public mojo::InterfaceFactory<FontService>,
+class FontServiceApp : public shell::ShellClient,
+                       public shell::InterfaceFactory<FontService>,
                        public FontService {
  public:
   FontServiceApp();
   ~FontServiceApp() override;
 
  private:
-  // mojo::ShellClient:
-  void Initialize(mojo::Connector* connector, const mojo::Identity& identity,
+  // shell::ShellClient:
+  void Initialize(shell::Connector* connector,
+                  const shell::Identity& identity,
                   uint32_t id) override;
-  bool AcceptConnection(mojo::Connection* connection) override;
+  bool AcceptConnection(shell::Connection* connection) override;
 
-  // mojo::InterfaceFactory<FontService>:
-  void Create(mojo::Connection* connection,
+  // shell::InterfaceFactory<FontService>:
+  void Create(shell::Connection* connection,
               mojo::InterfaceRequest<FontService> request) override;
 
   // FontService: