Remove DeviceMonitorLinux::WillDestroyCurrentMessageLoop().

device/hid/mock_hid_service.cc

 // Copyright 2015 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.
 
 #include "device/hid/mock_hid_service.h"
 
 namespace device {
 
 MockHidService::MockHidService() {}
 
-MockHidService::~MockHidService() {}
+MockHidService::~MockHidService() {
+  // Shutdown() must be called before the base class destructor.
+  Shutdown();
+}
 
 void MockHidService::AddDevice(scoped_refptr<HidDeviceInfo> info) {
   HidService::AddDevice(info);
 }
 
 void MockHidService::RemoveDevice(const HidDeviceId& device_id) {
   HidService::RemoveDevice(device_id);
 }
 
 void MockHidService::FirstEnumerationComplete() {
   HidService::FirstEnumerationComplete();
 }
 
 const std::map<HidDeviceId, scoped_refptr<HidDeviceInfo>>&
 MockHidService::devices() const {
   return HidService::devices();
 }
 
 }  // namespace device