[Media Router] Return NotFoundError on dialog exit if appropriate

chrome/test/media_router/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.
 
 # Browser test resource files.
 media_router_integration_test_resources = [
   "resources/basic_test.html",
   "resources/close_route_with_error_on_send.json",
   "resources/common.js",
   "resources/fail_create_route.json",
   "resources/fail_reconnect_session.html",
   "resources/fail_reconnect_session.json",
   "resources/no_provider.json",
+  "resources/no_sinks.json",
+  "resources/no_supported_sinks.json",
   "resources/route_creation_timed_out.json",
 ]
 
 media_router_test_extension_resources = [
   "telemetry/extension/manifest.json",
   "telemetry/extension/script.js",
 ]
 
 # GYP version: chrome/test/media_router/media_router_tests.gypi:
 # media_router_test_extension_files
@@ skipping 30 matching lines @@
   ]
   deps = [
     ":browser_tests_resource_files",
     "//chrome/browser/media/router:test_support",
     "//chrome/test:test_support",
     "//chrome/test:test_support_ui",
     "//skia",
     "//testing/gtest",
   ]
 }