Martin Kustermann 91ff075a74 Make dart wrappable classes use only one native field (flutter/engine#27350)
* Make dart wrappable classes use only one native field

It appears like the second native field is never really used for
anything: It is set, cleared and verified it was cleared, but that is
it.

=> The only native field that is necessary is the `this` pointer of the
   equivalent C++ object.
=> The [DartWrapperInfo] object which was stored as second native field
   is always accessible via the virtual `GetDartWrapperInfo()` method on
   `this`.
2021-07-13 16:39:22 +02:00
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