Roll Dart SDK from 7e3310b to a9cfcc2 (1 revision)

https://dart.googlesource.com/sdk.git/+log/7e3310bbe1ed..a9cfcc289ed4

2022-02-10 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.17.0-94.0.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 aaclarke@google.com,dart-vm-team@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

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': '7e3310bbe1edbf88193c64654fa63d762cd8e336',
+  'dart_revision': 'a9cfcc289ed49636695d8af0da87d8ed34bad657',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -232,7 +232,7 @@ deps = {
    Var('dart_git') + '/glob.git@da1f4595ee2f87982cbcc663d4cac244822d9227',
 
   'src/third_party/dart/third_party/pkg/html':
-   Var('dart_git') + '/html.git@00cd3c22dac0e68e6ed9e7e4945101aedb1b3109',
+   Var('dart_git') + '/html.git@3c2448108b431dd00d3a7033d9f43f19fa5d93d3',
 
   'src/third_party/dart/third_party/pkg/http':
    Var('dart_git') + '/http.git@1e42ffa181b263f7790f276a5465832bff7ce615',