Roll src/third_party/dart e7b1392b0205..e8c1391b26f7 (1 commits) (#15842)

https://dart.googlesource.com/sdk.git/+log/e7b1392b0205..e8c1391b26f7

git log e7b1392b0205..e8c1391b26f7 --date=short --first-parent --format='%ad %ae %s'
2020-01-20 dacoharkes@google.com [vm/ffi] Test truncation and extension on calls and callbacks

Created with:
  gclient setdep -r src/third_party/dart@e8c1391b26f7

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 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

Bug: None
Tbr: dart-vm-team@google.com

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'e7b1392b0205e9e18e904febae6a6210982135eb',
+  'dart_revision': 'e8c1391b26f745a1584ba0402147df542d6303a9',
 
   # 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

-Signature: 4fae255b517e95879a125c9a4081678c
+Signature: 4b458bdd1f00bc90df91ad5e6041dfbc
 
 UNUSED LICENSES: