Use std::default_delete as the default deleter for scoped_ptr.

device/hid/device_monitor_linux.h

 // 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.
 
 #ifndef DEVICE_HID_DEVICE_MONITOR_LINUX_H_
 #define DEVICE_HID_DEVICE_MONITOR_LINUX_H_
 
+#include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_pump_libevent.h"
 #include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "device/udev_linux/scoped_udev.h"
@@ skipping 29 matching lines @@
   void Enumerate(const EnumerateCallback& callback);
 
   // Implements base::MessageLoop::DestructionObserver
   void WillDestroyCurrentMessageLoop() override;
 
   // Implements base::MessagePumpLibevent::Watcher
   void OnFileCanReadWithoutBlocking(int fd) override;
   void OnFileCanWriteWithoutBlocking(int fd) override;
 
  private:
-  friend struct base::DefaultDeleter<DeviceMonitorLinux>;
+  friend std::default_delete<DeviceMonitorLinux>;
 
   ~DeviceMonitorLinux() override;
 
   ScopedUdevPtr udev_;
   ScopedUdevMonitorPtr monitor_;
   int monitor_fd_;
   base::MessagePumpLibevent::FileDescriptorWatcher monitor_watcher_;
 
   base::ObserverList<Observer, true> observers_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceMonitorLinux);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_HID_DEVICE_MONITOR_LINUX_H_