Remove the mojo serial interfaces and related infrastructure.

device/serial/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 # Library works only on desktop platforms.
 assert(is_win || is_linux || is_mac)
 
 config("platform_support") {
   visibility = [ ":serial" ]
   if (is_win) {
     libs = [ "setupapi.lib" ]
     ldflags = [ "/DELAYLOAD:setupapi.dll" ]
   }
 }
 
 static_library("serial") {
   output_name = "device_serial"
 
   sources = [
     "buffer.cc",
     "buffer.h",
-    "data_receiver.cc",
-    "data_receiver.h",
-    "data_sender.cc",
-    "data_sender.h",
-    "data_sink_receiver.cc",
-    "data_sink_receiver.h",
-    "data_source_sender.cc",
-    "data_source_sender.h",
-    "serial_connection.cc",
-    "serial_connection.h",
-    "serial_connection_factory.cc",
-    "serial_connection_factory.h",
     "serial_device_enumerator.cc",
     "serial_device_enumerator.h",
     "serial_device_enumerator_linux.cc",
     "serial_device_enumerator_linux.h",
     "serial_device_enumerator_mac.cc",
     "serial_device_enumerator_mac.h",
     "serial_device_enumerator_win.cc",
     "serial_device_enumerator_win.h",
     "serial_io_handler.cc",
     "serial_io_handler.h",
     "serial_io_handler_posix.cc",
     "serial_io_handler_posix.h",
     "serial_io_handler_win.cc",
     "serial_io_handler_win.h",
-    "serial_service_impl.cc",
-    "serial_service_impl.h",
   ]
 
   public_configs = [ ":platform_support" ]
 
   public_deps = [
     ":serial_mojo",
     "//base",
     "//device/core",
   ]
 
@@ skipping 31 matching lines @@
   ]
 }
 
 mojom("serial_mojo") {
   visibility = [
     ":serial",
     "//extensions:extensions_renderer_resources_grit",
   ]
 
   sources = [
-    "data_stream.mojom",
-    "data_stream_serialization.mojom",
     "serial.mojom",
-    "serial_serialization.mojom",
   ]
 
   use_new_wrapper_types = false
 }