Roll Dart SDK from 2ddf810f71f6 to 70c7daa78288 (1 revision) (flutter…

…#23922)

https://dart.googlesource.com/sdk.git/+log/2ddf810f71f6..70c7daa78288

2021-01-25 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-256.0.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 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/master/autoroll/README.md

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': '2ddf810f71f6cdceb0032faaec4e680807caf960',
+  'dart_revision': '70c7daa78288e213860dc8a826a49a52385a9333',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -50,7 +50,7 @@ vars = {
   'dart_linter_tag': '0.1.129',
   'dart_oauth2_tag': '1.6.0',
   'dart_protobuf_rev': '0d03fd588df69e9863e2a2efc0059dee8f18d5b2',
-  'dart_pub_rev': '267fb68add3b85a0f6698bf5ae2648f1a1df515b',
+  'dart_pub_rev': '0402c467547daa5886352cb315338ae54552d21c',
   'dart_resource_rev': '6b79867d0becf5395e5819a75720963b8298e9a7',
   'dart_root_certificates_rev': '7e5ec82c99677a2e5b95ce296c4d68b0d3378ed8',
   'dart_shelf_packages_handler_tag': '2.0.0',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 2ee3657d784843571a57a752683b92c1
+Signature: 6234763fbb4722552696f2792fba66d7
 
 UNUSED LICENSES: