Eliminate mojo::Shell client lib class

ui/views/mus/platform_test_helper_mus.cc

Index: ui/views/mus/platform_test_helper_mus.cc
diff --git a/ui/views/mus/platform_test_helper_mus.cc b/ui/views/mus/platform_test_helper_mus.cc
index bc99b4bdd7ea891bf212a2b6dd06aea6ad9d7a49..d6929c7cfb61b5bb2361641060c9aeaec9400feb 100644
--- a/ui/views/mus/platform_test_helper_mus.cc
+++ b/ui/views/mus/platform_test_helper_mus.cc
@@ -38,9 +38,9 @@ class PlatformTestHelperMus : public PlatformTestHelper {
     shell_connection_->WaitForInitialize();
     // ui/views/mus requires a WindowManager running, for now use the desktop
     // one.
-    mojo::Shell* shell = shell_connection_.get();
-    shell->Connect("mojo:desktop_wm");
-    WindowManagerConnection::Create(shell_connection_.get());
+    mojo::Connector* connector = shell_connection_->connector();
+    connector->Connect("mojo:desktop_wm");
+    WindowManagerConnection::Create(connector);
   }
 
   ~PlatformTestHelperMus() override {