Leak DeviceMonitorLinux on shutdown.

device/base/device_monitor_linux.cc

Index: device/base/device_monitor_linux.cc
diff --git a/device/base/device_monitor_linux.cc b/device/base/device_monitor_linux.cc
index cc64870b8cf17392507039756fe43eeef33af6ca..24aa95adc8e2e9cd4d2a10639b5178b96371d763 100644
--- a/device/base/device_monitor_linux.cc
+++ b/device/base/device_monitor_linux.cc
@@ -21,8 +21,8 @@ const char kUdevActionAdd[] = "add";
 const char kUdevActionRemove[] = "remove";
 
 // The instance will be reset when message loop destroys.
-base::LazyInstance<std::unique_ptr<DeviceMonitorLinux>>::Leaky
-    g_device_monitor_linux_ptr = LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<DeviceMonitorLinux>::Leaky g_device_monitor_linux =
+    LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
@@ -61,9 +61,7 @@ DeviceMonitorLinux::DeviceMonitorLinux() : monitor_fd_(-1) {
 
 // static
 DeviceMonitorLinux* DeviceMonitorLinux::GetInstance() {
-  if (!g_device_monitor_linux_ptr.Get().get())
-    g_device_monitor_linux_ptr.Get().reset(new DeviceMonitorLinux());
-  return g_device_monitor_linux_ptr.Get().get();
+  return g_device_monitor_linux.Pointer();
 }
 
 void DeviceMonitorLinux::AddObserver(Observer* observer) {
@@ -113,13 +111,11 @@ void DeviceMonitorLinux::WillDestroyCurrentMessageLoop() {
   DCHECK(thread_checker_.CalledOnValidThread());
   for (auto& observer : observers_)
     observer.WillDestroyMonitorMessageLoop();
-  g_device_monitor_linux_ptr.Get().reset(nullptr);
 }
 
 DeviceMonitorLinux::~DeviceMonitorLinux() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  base::MessageLoop::current()->RemoveDestructionObserver(this);
-  close(monitor_fd_);
+  // A leaky LazyInstance is never destroyed.
+  NOTREACHED();
 }
 
 void DeviceMonitorLinux::OnMonitorCanReadWithoutBlocking() {