[Chromecast] Restore CastDevToolsManagerDelegateTest

chromecast/app/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("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 source_set("app") {
   sources = [
     "cast_main_delegate.cc",
@@ skipping 50 matching lines @@
   sources = [
     "cast_test_launcher.cc",
   ]
 
   deps = [
     ":app",
     "//base",
     "//base/test:test_support",
     "//chromecast/base",
     "//content/test:test_support",
+    "//mojo/edk/embedder:headers",
   ]
 }
 
 source_set("unittests") {
   testonly = true
   sources = [
     "linux/cast_crash_reporter_client_unittest.cc",
   ]
 
   deps = [
@@ skipping 74 matching lines @@
     "chromecast_settings_ta.pak",
     "chromecast_settings_te.pak",
     "chromecast_settings_th.pak",
     "chromecast_settings_tr.pak",
     "chromecast_settings_uk.pak",
     "chromecast_settings_vi.pak",
     "chromecast_settings_zh-CN.pak",
     "chromecast_settings_zh-TW.pak",
   ]
 }