Handle USB device disconnection during early setup.

device/usb/mojo/device_impl.h

Index: device/usb/mojo/device_impl.h
diff --git a/device/usb/mojo/device_impl.h b/device/usb/mojo/device_impl.h
index 4f78ffcfd55a3a6aa987eabcc643c7d3fa64d43c..c6a8d5080c42c389d0a8fd59b649df777d250d58 100644
--- a/device/usb/mojo/device_impl.h
+++ b/device/usb/mojo/device_impl.h
@@ -46,8 +46,9 @@ class DeviceImpl : public Device, public device::UsbDevice::Observer {
                                     uint16_t index);
 
   // Handles completion of an open request.
-  void OnOpen(const OpenCallback& callback,
-              scoped_refptr<device::UsbDeviceHandle> handle);
+  static void OnOpen(base::WeakPtr<DeviceImpl> device,
+                     const OpenCallback& callback,
+                     scoped_refptr<device::UsbDeviceHandle> handle);
   void OnPermissionGrantedForOpen(const OpenCallback& callback, bool granted);
 
   // Device implementation: