Roll engine 611c345a4e76..49dbaae818cd (3 commits) (#42246)

git@github.com:flutter/engine.git/compare/611c345a4e76...49dbaae818cd

git log 611c345a4e76..49dbaae818cd --no-merges --oneline
2019-10-08 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from gB_ii... to q_uYX... (flutter/engine#12996)
2019-10-08 aam@google.com Roll dart to aece1c1e92. (flutter/engine#12997)
2019-10-08 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from wOfz2... to wuAtw... (flutter/engine#12995)


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 chinmaygarde@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

-611c345a4e766059fe349381267bfd04d1e1ed85
+49dbaae818cd158818f12f5d43ff334c9005c804