Revert "Roll Dart SDK from 7a5e410f982e to db99af14c4bc (1 revision) (#51986)"

This reverts commit 412ce8a.

Author: auto-submit[bot]

DEPS

@@ -62,7 +62,7 @@ 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': 'db99af14c4bc5b17cdc2d4dd8ba0a2d14af980dd',
+  'dart_revision': '7a5e410f982e25dc52e0bd05411a982f153a67a4',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py