Remove DeviceMonitorLinux::WillDestroyCurrentMessageLoop().

chrome/browser/chrome_device_client.h

Index: chrome/browser/chrome_device_client.h
diff --git a/chrome/browser/chrome_device_client.h b/chrome/browser/chrome_device_client.h
index a4ed096d07bfbcf1670d166c5001e7e300b7c9c4..df643e59bd4aa31c770df1719c997c0f4567d2fd 100644
--- a/chrome/browser/chrome_device_client.h
+++ b/chrome/browser/chrome_device_client.h
@@ -9,7 +9,7 @@
 
 #include <memory>
 
-#include "base/compiler_specific.h"
+#include "base/logging.h"
 #include "base/macros.h"
 
 // Implementation of device::DeviceClient that returns //device service
@@ -19,11 +19,18 @@ class ChromeDeviceClient : device::DeviceClient {
   ChromeDeviceClient();
   ~ChromeDeviceClient() override;
 
+  // Must be called before the destructor, when the FILE thread is still alive.
+  void Shutdown();
+
   // device::DeviceClient implementation
   device::UsbService* GetUsbService() override;
   device::HidService* GetHidService() override;
 
  private:
+#if DCHECK_IS_ON()
+  bool did_shutdown_ = false;
+#endif
+
   std::unique_ptr<device::HidService> hid_service_;
   std::unique_ptr<device::UsbService> usb_service_;