Reverts "Roll Dart SDK from 7a5e410f982e to db99af14c4bc (1 revision) (flutter#51986)" (flutter#51989)

Reverts: flutter#51986
Initiated by: zanderso
Reason for reverting: flutter/flutter#146506
Original PR Author: skia-flutter-autoroll

Reviewed By: {fluttergithubbot}

This change reverts the following previous change:

https://dart.googlesource.com/sdk.git/+log/7a5e410f982e..db99af14c4bc

2024-04-09 [email protected] Version 3.5.0-38.0.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 [email protected],[email protected] 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://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

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