Roll Dart SDK from 1e098b6 to f4a696c (2 revisions) (#30922)

https://dart.googlesource.com/sdk.git/+log/1e098b6e5ef0..f4a696c76682

2022-01-19 [email protected] Version 2.17.0-30.0.dev
2022-01-19 [email protected] Version 2.17.0-29.0.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://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

Author: skia-flutter-autoroll

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': '1e098b6e5ef0741ac3e942623c9a51c639a9514d',
+  'dart_revision': 'f4a696c766828f819eec826cdb537e988f363b61',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: a6c296a1a341b4bf66c0f202a397610c
+Signature: 8fe8cf68488e80b3b8ef147b6e010220
 
 UNUSED LICENSES:
 
@@ -10282,7 +10282,6 @@ FILE: ../../../third_party/dart/runtime/lib/isolate.cc
 FILE: ../../../third_party/dart/runtime/lib/mirrors.cc
 FILE: ../../../third_party/dart/runtime/lib/regexp.cc
 FILE: ../../../third_party/dart/runtime/lib/stopwatch.cc
-FILE: ../../../third_party/dart/runtime/lib/weak_property.cc
 FILE: ../../../third_party/dart/runtime/platform/assert.cc
 FILE: ../../../third_party/dart/runtime/platform/assert.h
 FILE: ../../../third_party/dart/runtime/platform/floating_point.h