Mojo: Make device/ to not rely on connecton error notification on message loop destruction.

device/usb/mojo/device_manager_impl.cc

Index: device/usb/mojo/device_manager_impl.cc
diff --git a/device/usb/mojo/device_manager_impl.cc b/device/usb/mojo/device_manager_impl.cc
index 3836c9744b0aa73ba1573902ba3a6059bc400d6e..a498ff64321aa4a2075ed4e9d3fdfbd7ab3a5f68 100644
--- a/device/usb/mojo/device_manager_impl.cc
+++ b/device/usb/mojo/device_manager_impl.cc
@@ -47,8 +47,8 @@ DeviceManagerImpl::DeviceManagerImpl(
       binding_(this, std::move(request)),
       weak_factory_(this) {
   // This object owns itself and will be destroyed if the message pipe it is
-  // bound to is closed or the UsbService is shut down.
-  binding_.set_connection_error_handler([this]() { delete this; });
+  // bound to is closed, the message loop is destructed, or the UsbService is
+  // shut down.
   observer_.Add(usb_service_);
 }