Roll Dart SDK from c9f1521 to e4fa78b (1 revision)

https://dart.googlesource.com/sdk.git/+log/c9f1521fd3fe..e4fa78b5025a

2021-07-28 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.14.0-359.0.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,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/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -35,7 +35,7 @@ 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': 'c9f1521fd3fe02dc135676337ee803702abff5ac',
+  'dart_revision': 'e4fa78b5025a3ecd983bbc31a81f08e61e86fa94',
 
   # 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: 65f4daa7686ebedf77d5fcaf7ca46727
+Signature: 7b094debc7dcc1504974b899a924c5d2
 
 UNUSED LICENSES: