Clean up potentially leaky use of base::DeletePointer.

device/core/device_monitor_win.cc

Index: device/core/device_monitor_win.cc
diff --git a/device/core/device_monitor_win.cc b/device/core/device_monitor_win.cc
index 3449c82350e658b5b93379141946f63a8ce993cc..5048741b45e591ac767cc95b41108b63ccd9425b 100644
--- a/device/core/device_monitor_win.cc
+++ b/device/core/device_monitor_win.cc
@@ -42,8 +42,7 @@ class DeviceMonitorMessageWindow {
       g_message_window = new DeviceMonitorMessageWindow();
       if (g_message_window->Init()) {
         base::AtExitManager::RegisterTask(
-          base::Bind(&base::DeletePointer<DeviceMonitorMessageWindow>,
-                     base::Unretained(g_message_window)));
+            base::Bind(&DeviceMonitorMessageWindow::Delete));
       } else {
         delete g_message_window;
         g_message_window = nullptr;
@@ -64,9 +63,10 @@ class DeviceMonitorMessageWindow {
   DeviceMonitorWin* GetForAllInterfaces() { return &all_device_monitor_; }
 
  private:
-  friend void base::DeletePointer<DeviceMonitorMessageWindow>(
-      DeviceMonitorMessageWindow* message_window);
-
+  static void Delete() {
+    delete g_message_window;
+    g_message_window = nullptr;
+  }
   DeviceMonitorMessageWindow() {
   }