Make it possible to disable udev in linux

content/browser/device_monitor_linux.cc

Index: content/browser/device_monitor_linux.cc
diff --git a/content/browser/device_monitor_linux.cc b/content/browser/device_monitor_linux.cc
deleted file mode 100644
index 61aad7c113cc2b86329eb4971104e4ca8be3608d..0000000000000000000000000000000000000000
--- a/content/browser/device_monitor_linux.cc
+++ /dev/null
@@ -1,87 +0,0 @@
-// Copyright (c) 2012 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.
-
-// libudev is used for monitoring device changes.
-
-#include "content/browser/device_monitor_linux.h"
-
-#include <libudev.h>
-
-#include <string>
-
-#include "base/system_monitor/system_monitor.h"
-#include "content/browser/udev_linux.h"
-#include "content/public/browser/browser_thread.h"
-
-namespace {
-
-struct SubsystemMap {
-  base::SystemMonitor::DeviceType device_type;
-  const char* subsystem;
-  const char* devtype;
-};
-
-const char kAudioSubsystem[] = "sound";
-const char kVideoSubsystem[] = "video4linux";
-
-// Add more subsystems here for monitoring.
-const SubsystemMap kSubsystemMap[] = {
-  { base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE, kAudioSubsystem, NULL },
-  { base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE, kVideoSubsystem, NULL },
-};
-
-}  // namespace
-
-namespace content {
-
-DeviceMonitorLinux::DeviceMonitorLinux() {
-  DCHECK(BrowserThread::IsMessageLoopValid(BrowserThread::IO));
-  BrowserThread::PostTask(BrowserThread::IO,
-      FROM_HERE,
-      base::Bind(&DeviceMonitorLinux::Initialize, base::Unretained(this)));
-}
-
-DeviceMonitorLinux::~DeviceMonitorLinux() {
-}
-
-void DeviceMonitorLinux::Initialize() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  // We want to be notified of IO message loop destruction to delete |udev_|.
-  base::MessageLoop::current()->AddDestructionObserver(this);
-
-  std::vector<UdevLinux::UdevMonitorFilter> filters;
-  for (size_t i = 0; i < arraysize(kSubsystemMap); ++i) {
-    filters.push_back(UdevLinux::UdevMonitorFilter(
-        kSubsystemMap[i].subsystem, kSubsystemMap[i].devtype));
-  }
-  udev_.reset(new UdevLinux(filters,
-      base::Bind(&DeviceMonitorLinux::OnDevicesChanged,
-                 base::Unretained(this))));
-}
-
-void DeviceMonitorLinux::WillDestroyCurrentMessageLoop() {
-  // Called on IO thread.
-  udev_.reset();
-}
-
-void DeviceMonitorLinux::OnDevicesChanged(udev_device* device) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DCHECK(device);
-
-  base::SystemMonitor::DeviceType device_type =
-      base::SystemMonitor::DEVTYPE_UNKNOWN;
-  std::string subsystem(udev_device_get_subsystem(device));
-  for (size_t i = 0; i < arraysize(kSubsystemMap); ++i) {
-    if (subsystem == kSubsystemMap[i].subsystem) {
-      device_type = kSubsystemMap[i].device_type;
-      break;
-    }
-  }
-  DCHECK_NE(device_type, base::SystemMonitor::DEVTYPE_UNKNOWN);
-
-  base::SystemMonitor::Get()->ProcessDevicesChanged(device_type);
-}
-
-}  // namespace content