Move DeviceMonitorLinux to //device/core.

device/hid/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("//testing/libfuzzer/fuzzer_test.gni")
 
 source_set("hid") {
   sources = [
     "hid_collection_info.cc",
@@ skipping 28 matching lines @@
 
   deps = [
     "//base",
     "//components/device_event_log",
     "//device/core",
     "//net",
   ]
 
   if (is_linux && use_udev) {
     sources += [
-      "device_monitor_linux.cc",
-      "device_monitor_linux.h",
       "fake_input_service_linux.cc",
       "fake_input_service_linux.h",
       "hid_service_linux.cc",
       "hid_service_linux.h",
       "input_service_linux.cc",
       "input_service_linux.h",
     ]
     deps += [ "//device/udev_linux" ]
   }
 
@@ skipping 26 matching lines @@
 fuzzer_test("hid_report_descriptor_fuzzer") {
   sources = [
     "hid_report_descriptor_fuzzer.cc",
   ]
   deps = [
     ":hid",
   ]
   seed_corpus = "fuzz_corpus"
   libfuzzer_options = [ "max_len=2048" ]
 }