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

device/usb/mojo/device_impl.cc

Index: device/usb/mojo/device_impl.cc
diff --git a/device/usb/mojo/device_impl.cc b/device/usb/mojo/device_impl.cc
index dddf6815230d36c53aa83eff063d45a773f76c15..611ac096579550b0479ea1582613c95e32a2cc39 100644
--- a/device/usb/mojo/device_impl.cc
+++ b/device/usb/mojo/device_impl.cc
@@ -138,9 +138,9 @@ DeviceImpl::DeviceImpl(scoped_refptr<UsbDevice> device,
   DCHECK(device_);
   // This object owns itself and will be destroyed if,
   //  * the device is disconnected or
-  //  * the message pipe it is bound to is closed
+  //  * the message pipe it is bound to is closed or the message loop is
+  //  * destructed.
   observer_.Add(device_.get());
-  binding_.set_connection_error_handler([this]() { delete this; });
 }
 
 DeviceImpl::~DeviceImpl() {