Motown: Get rid of speculative clock definition

mojo/dart/packages/mojo_services/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("//mojo/public/dart/rules.gni")
 import("//mojo/services/mojo_services.gni")
 
 # TODO(johnmccutchan): Automate this.
 # for i in `find lib/|grep mojom.dart|sort`;do echo "  \"$i\",";done
 bindings_sources = [
@@ skipping 35 matching lines @@
   "lib/mojo/http_connection.mojom.dart",
   "lib/mojo/http_message.mojom.dart",
   "lib/mojo/http_server.mojom.dart",
   "lib/mojo/input_event_constants.mojom.dart",
   "lib/mojo/input_events.mojom.dart",
   "lib/mojo/input_key_codes.mojom.dart",
   "lib/mojo/location.mojom.dart",
   "lib/mojo/location_service.mojom.dart",
   "lib/mojo/media/audio_server.mojom.dart",
   "lib/mojo/media/audio_track.mojom.dart",
-  "lib/mojo/media/media_clock.mojom.dart",
   "lib/mojo/media/media_common.mojom.dart",
   "lib/mojo/media/media_factory.mojom.dart",
   "lib/mojo/media/media_metadata.mojom.dart",
   "lib/mojo/media/media_player.mojom.dart",
   "lib/mojo/media/media_sink.mojom.dart",
   "lib/mojo/media/media_source.mojom.dart",
   "lib/mojo/media/media_state.mojom.dart",
   "lib/mojo/media/media_transport.mojom.dart",
   "lib/mojo/media/media_type_converter.mojom.dart",
   "lib/mojo/media/media_types.mojom.dart",
@@ skipping 43 matching lines @@
               "CHANGELOG.md",
               "README.md",
               "pubspec.yaml",
             ] + bindings_sources
 
   deps = [
     "//mojo/services",
     "//third_party/dart-pkg",
   ]
 }