Roll src/third_party/dart a8251f820b09..1210d27678a0 (5 commits) (#17528)

diff --git a/DEPS b/DEPS
index d39e0a6..becb521 100644
--- a/DEPS
+++ b/DEPS
@@ -34,7 +34,7 @@
   # 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': 'a8251f820b0975f07f9868c8468d0b32805857e2',
+  'dart_revision': '1210d27678a05e5e69d82766809d816b7aa91830',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
index 5f65d98..bc5cce6 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: e9de4774ec7951bd1a1095a6b5716426
+Signature: 94fc349da32da798da36c79d18f58784
 
 UNUSED LICENSES: