Roll Dart SDK from f568598 to 49d5a2f (3 revisions)

https://dart.googlesource.com/sdk.git/+log/f568598a262e..49d5a2f58c4a

2021-12-11 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.16.0-101.0.dev
2021-12-10 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.16.0-100.0.dev
2021-12-10 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.16.0-99.0.dev

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

To file a bug in Flutter Engine: https://github.com/flutter/flutter/issues/new/choose

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/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -39,7 +39,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'f568598a262ed53bcb03e40d2b6b9a6408189175',
+  'dart_revision': '49d5a2f58c4a9e403c6bc2b19a50a382ae422fe0',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: c0891eb5d4a456ec00567c54e957faca
+Signature: 5b0065dc5a0d65844aa2f5ce2c4d6ca2
 
 UNUSED LICENSES: