Roll src/third_party/dart 29c00e28f350..f99631b12c4a (29 commits) (#18373)

diff --git a/DEPS b/DEPS
index cdb504c..bcda645 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': '29c00e28f35033b08129ff6c6c7b0aeca669647c',
+  'dart_revision': 'f99631b12c4ae3f1771ef68b1ae8c57a0dd9434d',
 
   # 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 73f326e..1ee1008 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: b84048688e610ad7bc555f928871c7a3
+Signature: 958fcd70bbca94347d1faced2ab97385
 
 UNUSED LICENSES: