Remove DeviceMonitorLinux::WillDestroyCurrentMessageLoop().

device/hid/hid_service.cc

 // 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.
 
 #include "device/hid/hid_service.h"
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 31 matching lines @@
   return base::WrapUnique(new HidServiceLinux(file_task_runner));
 #elif defined(OS_MACOSX)
   return base::WrapUnique(new HidServiceMac(file_task_runner));
 #elif defined(OS_WIN)
   return base::WrapUnique(new HidServiceWin(file_task_runner));
 #else
   return nullptr;
 #endif
 }
 
+void HidService::Shutdown() {
+#if DCHECK_IS_ON()
+  DCHECK(!did_shutdown_);
+  did_shutdown_ = true;
+#endif
+}
+
 void HidService::GetDevices(const GetDevicesCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (enumeration_ready_) {
     std::vector<scoped_refptr<HidDeviceInfo>> devices;
     for (const auto& map_entry : devices_) {
       devices.push_back(map_entry.second);
     }
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(callback, devices));
   } else {
@@ skipping 13 matching lines @@
 scoped_refptr<HidDeviceInfo> HidService::GetDeviceInfo(
     const HidDeviceId& device_id) const {
   DCHECK(thread_checker_.CalledOnValidThread());
   DeviceMap::const_iterator it = devices_.find(device_id);
   if (it == devices_.end()) {
     return nullptr;
   }
   return it->second;
 }
 
-HidService::HidService() : enumeration_ready_(false) {
-}
+HidService::HidService() = default;
 
 HidService::~HidService() {
   DCHECK(thread_checker_.CalledOnValidThread());
+#if DCHECK_IS_ON()
+  DCHECK(did_shutdown_);
+#endif
 }
 
 void HidService::AddDevice(scoped_refptr<HidDeviceInfo> device_info) {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!base::ContainsKey(devices_, device_info->device_id())) {
     devices_[device_info->device_id()] = device_info;
 
     HID_LOG(USER) << "HID device "
                   << (enumeration_ready_ ? "added" : "detected")
                   << ": vendorId=" << device_info->vendor_id()
@@ skipping 38 matching lines @@
     }
 
     for (const GetDevicesCallback& callback : pending_enumerations_) {
       callback.Run(devices);
     }
     pending_enumerations_.clear();
   }
 }
 
 }  // namespace device