Stop disposing Notifications and Controllers from import_export.

[kenzieschmoll]

Fixes #1637.

[jacob314]

[terrylucas]

Kenzie,

You'll want to either remove my TODO and commented out dispose or enable the notifications?.dispose() in config_specific/flutter/drag_drop.dart

@OverRide
void dispose() {
// TODO(Kenzie): Disabled see issue #1637.
// notifications?.dispose();
super.dispose();
}

[kenzieschmoll]

I noticed that after I landed this CL. I have a pending import PR that includes this change.

[terrylucas]

Thanks

…

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