Remove MOJO_SHELL_CLIENT define.

chrome/browser/resources/chromeos/chromevox/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/features.gni")
 import("//testing/test.gni")
 import("//chrome/test/base/js2gtest.gni")
 import("chromevox.gni")
 
 assert(is_chromeos)
@@ skipping 322 matching lines @@
     "//chrome:packed_extra_resources",
     "//chrome:packed_resources",
     "//chrome:resources",
     "//chrome:strings",
     "//chrome/browser",
     "//chrome/renderer",
     "//chrome/test:browser_tests_runner",
     "//chrome/test:test_support",
     "//chrome/test:test_support_ui",
     "//content/test:test_support",
+    "//services/shell/background:lib",
+    "//services/shell/background/tests:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }
 
 action("chromevox_test_messages_js") {
   script = "tools/generate_test_messages.py"
   sources = [
     "$chromevox_out_dir/_locales/en/messages.json",
   ]
@@ skipping 45 matching lines @@
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 }
 
 js2gtest("chromevox_extjs_tests") {
   test_type = "extension"
   sources = chromevox_tests_gypi_values.chromevox_tests_extjs_sources
   gen_include_files =
       chromevox_tests_gypi_values.chromevox_tests_ext_gen_include_sources
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 }