[not for commit] try out fix with darin's cl.

content/content_common_mojo_bindings.gyp

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       # GN version: //content/common:mojo_bindings
       'target_name': 'content_common_mojo_bindings_mojom',
       'type': 'none',
       'variables': {
         'mojom_files': [
           # NOTE: Sources duplicated in //content/common/BUILD.gn:mojo_bindings.
           'common/frame.mojom',
           'common/image_downloader/image_downloader.mojom',
           'common/leveldb_wrapper.mojom',
           'common/process_control.mojom',
           'common/render_frame_message_filter.mojom',
           'common/service_worker/embedded_worker_setup.mojom',
           'common/storage_partition_service.mojom',
-          'common/websocket.mojom',
           '../third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom',
         ],
         'mojom_typemaps': [
           'common/bluetooth/web_bluetooth_device_id.typemap',
           '../device/bluetooth/public/interfaces/bluetooth_uuid.typemap',
           '../skia/public/interfaces/skbitmap.typemap',
           '../ui/gfx/geometry/mojo/geometry.typemap',
           '../url/mojo/gurl.typemap',
           '../url/mojo/origin.typemap',
         ],
@@ skipping 21 matching lines @@
         '../skia/skia.gyp:skia',
         'content_common_mojo_bindings_mojom',
       ],
       'export_dependent_settings': [
         '../skia/skia.gyp:skia',
         '../url/url.gyp:url_mojom',
       ],
     },
   ]
 }