Remove unnecessary dependencies on mojo/edk/system

components/mus/common/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 import("//testing/test.gni")
 
 component("mus_common") {
   sources = [
@@ skipping 64 matching lines @@
   ]
   public_deps = [
     ":mus_common",
   ]
   deps = [
     ":run_all_shelltests",
     "//base",
     "//base/test:test_config",
     "//components/mus/public/interfaces",
     "//ipc:ipc",
-    "//mojo/edk/test:test_support",
     "//testing/gtest",
     "//ui/gfx:test_support",
     "//ui/gfx/ipc",
   ]
 }
 
 mojo_application_manifest("mus_common_unittests_app_manifest") {
   application_name = "mus_common_unittests_app"
   source = "mus_common_unittests_app_manifest.json"
 }