Eliminate mojo::Shell client lib class

mash/shell/shell_application_delegate.h

Index: mash/shell/shell_application_delegate.h
diff --git a/mash/shell/shell_application_delegate.h b/mash/shell/shell_application_delegate.h
index 524a554a0e6ab2e7a109b9657b8e2c905f58431b..a429f34a438155919f1fcda7e4f71170c3e4d034 100644
--- a/mash/shell/shell_application_delegate.h
+++ b/mash/shell/shell_application_delegate.h
@@ -33,7 +33,7 @@ class ShellApplicationDelegate
 
  private:
   // mojo::ShellClient:
-  void Initialize(mojo::Shell* shell, const std::string& url,
+  void Initialize(mojo::Connector* connector, const std::string& url,
                   uint32_t id, uint32_t user_id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
@@ -60,7 +60,7 @@ class ShellApplicationDelegate
   void StartRestartableService(const std::string& url,
                                const base::Closure& restart_callback);
 
-  mojo::Shell* shell_;
+  mojo::Connector* connector_;
   std::map<std::string, scoped_ptr<mojo::Connection>> connections_;
   bool screen_locked_;
   mojo::BindingSet<mash::shell::mojom::Shell> bindings_;