Remove DeviceMonitorLinux::WillDestroyCurrentMessageLoop().

extensions/shell/browser/shell_device_client.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 "extensions/shell/browser/shell_device_client.h"
 
-#include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
 #include "device/hid/hid_service.h"
 #include "device/usb/usb_service.h"
 
 using content::BrowserThread;
 
 namespace extensions {
 
 ShellDeviceClient::ShellDeviceClient() {}
 
-ShellDeviceClient::~ShellDeviceClient() {}
+ShellDeviceClient::~ShellDeviceClient() {
+#if DCHECK_IS_ON()
+  DCHECK(did_shutdown_);
+#endif
+}
+
+void ShellDeviceClient::Shutdown() {
+  if (usb_service_)
+    usb_service_->Shutdown();
+  if (hid_service_)
+    hid_service_->Shutdown();
+#if DCHECK_IS_ON()
+  did_shutdown_ = true;
+#endif
+}
 
 device::UsbService* ShellDeviceClient::GetUsbService() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   if (!usb_service_) {
     usb_service_ = device::UsbService::Create(
         BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE));
   }
   return usb_service_.get();
 }
 
 device::HidService* ShellDeviceClient::GetHidService() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!hid_service_) {
     hid_service_ = device::HidService::Create(
         BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE));
   }
   return hid_service_.get();
 }
 
 }