fdb7bbf31 Revert "Close the tree (#12268)" (flutter/engine#12272) (#40469)

git@github.com:flutter/engine.git/compare/e12decfdd210...fdb7bbf3192a

git log e12decfdd210..fdb7bbf3192a --no-merges --oneline
2019-09-13 dnfield@google.com Revert "Close the tree (#12268)" (flutter/engine#12272)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC jimgraham@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

bin/internal/engine.version

-e12decfdd210efdd7cc73b4311f0c62bb27c215e
+fdb7bbf3192a45d828aee432c6c85d2c7d123746