Remove the mojo serial interfaces and related infrastructure.

device/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("//build/config/features.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
@@ skipping 89 matching lines @@
   # Android doesn't compile.
   # Linux, requires udev.
   if (!is_linux_without_udev && !is_android) {
     sources += [
       "hid/hid_connection_unittest.cc",
       "hid/hid_device_filter_unittest.cc",
       "hid/hid_report_descriptor_unittest.cc",
       "hid/input_service_linux_unittest.cc",
       "hid/test_report_descriptors.cc",
       "hid/test_report_descriptors.h",
-      "serial/data_sink_unittest.cc",
-      "serial/data_source_unittest.cc",
-      "serial/serial_connection_unittest.cc",
       "serial/serial_io_handler_posix_unittest.cc",
-      "serial/serial_service_unittest.cc",
     ]
     deps += [
       "//device/hid",
       "//device/serial",
       "//device/serial:test_support",
     ]
   }
 
   if (use_udev) {
     sources += [ "udev_linux/udev_unittest.cc" ]
@@ skipping 150 matching lines @@
     ]
     srcjar_deps = [ "//device/gamepad:java_enums_srcjar" ]
   }
 
   java_cpp_enum("bluetooth_test_javagen") {
     sources = [
       "bluetooth/test/bluetooth_test.h",
     ]
   }
 }