stuartmorgan ac99ac4c27 Fix destruction order in C++ plugin registrar (flutter/engine#21840)
The C++ wrapper's plugin registrar can own plugins to provided lifetime
management. However, plugins expect the registrar to be valid for the
life of the object, including during destruction, so any owned plugins
must be explicitly cleared before any registrar-specific destruction
happens.
2020-10-15 10:54:08 -07:00
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