[userpicker_base_shell] delete directory

Removes the bin/userpicker_base_shell directory.
Requires fxr/326673 to land before merging to
avoid breaking the workstation product.

Change-Id: I5526f18237fe57b9cef1eca6e87532f8f23ba001
diff --git a/BUILD.gn b/BUILD.gn
index b570b65..047844a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -17,7 +17,6 @@
     "//topaz/app/spinning_cube",
     "//topaz/bin/fidlgen_dart:install(//build/toolchain:host_x64)",
     "//topaz/bin/system_dashboard",
-    "//topaz/bin/userpicker_base_shell",
     "//topaz/examples/fidl/compiler",
     "//topaz/examples/fidl/echo_client_async_dart",
     "//topaz/examples/fidl/echo_server_async_dart",
diff --git a/bin/userpicker_base_shell/BUILD.gn b/bin/userpicker_base_shell/BUILD.gn
deleted file mode 100644
index eb9acf8..0000000
--- a/bin/userpicker_base_shell/BUILD.gn
+++ /dev/null
@@ -1,10 +0,0 @@
-# Copyright 2017 The Fuchsia Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-group("userpicker_base_shell") {
-    testonly = true
-    public_deps = [
-        "//src/experiences/session_shells/ermine/login_shell:userpicker_base_shell"
-    ]
-}
\ No newline at end of file