Remove DeviceMonitorLinux::WillDestroyCurrentMessageLoop().

extensions/shell/browser/shell_device_client.cc

Index: extensions/shell/browser/shell_device_client.cc
diff --git a/extensions/shell/browser/shell_device_client.cc b/extensions/shell/browser/shell_device_client.cc
index 81dabf4c72a527d5ca057d0475b07259b5546692..f820ea1aae1383aad46849f2419ae4c3fe4432c7 100644
--- a/extensions/shell/browser/shell_device_client.cc
+++ b/extensions/shell/browser/shell_device_client.cc
@@ -4,7 +4,6 @@
 
 #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"
@@ -15,7 +14,21 @@ 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);