Remove the mojo serial interfaces and related infrastructure.

extensions/renderer/resources/extensions_renderer_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1" output_all_resource_defines="false">
   <outputs>
     <output filename="grit/extensions_renderer_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="extensions_renderer_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
     <includes>
       <!-- Extension libraries. -->
       <include name="IDR_APP_VIEW_JS" file="guest_view/app_view/app_view.js" type="BINDATA" />
       <include name="IDR_ASYNC_WAITER_JS" file="async_waiter.js" type="BINDATA" />
       <include name="IDR_BROWSER_TEST_ENVIRONMENT_SPECIFIC_BINDINGS_JS" file="browser_test_environment_specific_bindings.js" type="BINDATA" />
-      <include name="IDR_DATA_RECEIVER_JS" file="data_receiver.js" type="BINDATA" />
-      <include name="IDR_DATA_SENDER_JS" file="data_sender.js" type="BINDATA" />
-      <include name="IDR_DATA_STREAM_MOJOM_JS" file="${mojom_root}\device\serial\data_stream.mojom.js" use_base_dir="false" type="BINDATA" />
-      <include name="IDR_DATA_STREAM_SERIALIZATION_MOJOM_JS" file="${mojom_root}\device\serial\data_stream_serialization.mojom.js" use_base_dir="false" type="BINDATA" />
       <include name="IDR_ENTRY_ID_MANAGER" file="entry_id_manager.js" type="BINDATA" />
       <include name="IDR_EVENT_BINDINGS_JS" file="event.js" type="BINDATA" />
       <include name="IDR_EXTENSION_OPTIONS_JS" file="guest_view/extension_options/extension_options.js" type="BINDATA"/>
       <include name="IDR_EXTENSION_OPTIONS_ATTRIBUTES_JS" file="guest_view/extension_options/extension_options_attributes.js" type="BINDATA"/>
       <include name="IDR_EXTENSION_OPTIONS_CONSTANTS_JS" file="guest_view/extension_options/extension_options_constants.js" type="BINDATA"/>
       <include name="IDR_EXTENSION_OPTIONS_EVENTS_JS" file="guest_view/extension_options/extension_options_events.js" type="BINDATA"/>
       <include name="IDR_EXTENSION_VIEW_JS" file="guest_view/extension_view/extension_view.js" type="BINDATA" />
       <include name="IDR_EXTENSION_VIEW_API_METHODS_JS" file="guest_view/extension_view/extension_view_api_methods.js" type="BINDATA" />
       <include name="IDR_EXTENSION_VIEW_ATTRIBUTES_JS" file="guest_view/extension_view/extension_view_attributes.js" type="BINDATA" />
       <include name="IDR_EXTENSION_VIEW_CONSTANTS_JS" file="guest_view/extension_view/extension_view_constants.js" type="BINDATA" />
@@ skipping 10 matching lines @@
       <include name="IDR_JSON_SCHEMA_JS" file="json_schema.js" type="BINDATA" />
       <include name="IDR_KEEP_ALIVE_JS" file="keep_alive.js" type="BINDATA" />
       <include name="IDR_KEEP_ALIVE_MOJOM_JS" file="${mojom_root}\extensions\common\mojo\keep_alive.mojom.js" use_base_dir="false" type="BINDATA" />
       <include name="IDR_LAST_ERROR_JS" file="last_error.js" type="BINDATA" />
       <include name="IDR_MESSAGING_JS" file="messaging.js" type="BINDATA" />
       <include name="IDR_MESSAGING_UTILS_JS" file="messaging_utils.js" type="BINDATA" />
       <include name="IDR_MIME_HANDLER_PRIVATE_CUSTOM_BINDINGS_JS" file="mime_handler_private_custom_bindings.js" type="BINDATA" />
       <include name="IDR_MIME_HANDLER_MOJOM_JS" file="${mojom_root}\extensions\common\api\mime_handler.mojom.js" use_base_dir="false" type="BINDATA" />
       <include name="IDR_SCHEMA_UTILS_JS" file="schema_utils.js" type="BINDATA" />
       <include name="IDR_SEND_REQUEST_JS" file="send_request.js" type="BINDATA" />
-      <include name="IDR_SERIAL_CUSTOM_BINDINGS_JS" file="serial_custom_bindings.js" type="BINDATA" />
-      <include name="IDR_SERIAL_MOJOM_JS" file="${mojom_root}\device\serial\serial.mojom.js" use_base_dir="false" type="BINDATA" />
-      <include name="IDR_SERIAL_SERIALIZATION_MOJOM_JS" file="${mojom_root}\device\serial\serial_serialization.mojom.js" use_base_dir="false" type="BINDATA" />
-      <include name="IDR_SERIAL_SERVICE_JS" file="serial_service.js" type="BINDATA" />
       <include name="IDR_SET_ICON_JS" file="set_icon.js" type="BINDATA" />
-      <include name="IDR_STASH_CLIENT_JS" file="stash_client.js" type="BINDATA" />
-      <include name="IDR_STASH_MOJOM_JS" file="${mojom_root}\extensions\common\mojo\stash.mojom.js" use_base_dir="false" type="BINDATA" />
       <include name="IDR_TEST_CUSTOM_BINDINGS_JS" file="test_custom_bindings.js" type="BINDATA" />
       <include name="IDR_UNCAUGHT_EXCEPTION_HANDLER_JS" file="uncaught_exception_handler.js" type="BINDATA" />
       <include name="IDR_UTILS_JS" file="utils.js" type="BINDATA" />
       <include name="IDR_WEB_VIEW_ACTION_REQUESTS_JS" file="guest_view/web_view/web_view_action_requests.js" type="BINDATA" />
       <include name="IDR_WEB_VIEW_API_METHODS_JS" file="guest_view/web_view/web_view_api_methods.js" type="BINDATA" />
       <include name="IDR_WEB_VIEW_ATTRIBUTES_JS" file="guest_view/web_view/web_view_attributes.js" type="BINDATA" />
       <include name="IDR_WEB_VIEW_CONSTANTS_JS" file="guest_view/web_view/web_view_constants.js" type="BINDATA" />
       <include name="IDR_WEB_VIEW_EVENTS_JS" file="guest_view/web_view/web_view_events.js" type="BINDATA" />
       <include name="IDR_WEB_VIEW_INTERNAL_CUSTOM_BINDINGS_JS" file="guest_view/web_view/web_view_internal.js" type="BINDATA" />
       <include name="IDR_WEB_VIEW_JS" file="guest_view/web_view/web_view.js" type="BINDATA" />
@@ skipping 36 matching lines @@
         <include name="IDR_MEDIA_ROUTER_BINDINGS_JS" file="media_router_bindings.js" type="BINDATA" />
         <include name="IDR_MOJO_COMMON_CUSTOM_TYPES_MOJOM_JS" file="${mojom_root}\mojo\common\common_custom_types.mojom.js" use_base_dir="false" type="BINDATA" />
       </if>
     </includes>
     <structures>
       <!-- Extension styles. -->
       <structure name="IDR_EXTENSION_CSS" file="extension.css" type="chrome_html" flattenhtml="true" />
     </structures>
   </release>
 </grit>