Jason Simmons 6856d1b63d Remove the weak pointer factory from the service isolate's DartIsolate object (flutter/engine#5041)
The WeakPtrFactory must be deleted on the thread where it was created.
However, the service isolate is created and destroyed on threads from
the Dart thread pool, and the creating thread may not be the same as
the destroying thread.
2018-04-18 13:02:19 -07:00
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