Roll src/third_party/dart 999eeea..3883c60 (5 commits) (#16666)

Author: skia-flutter-autoroll

DEPS

@@ -34,7 +34,7 @@ vars = {
   # 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': '999eeea5a3ff7ee4cce5016f77c6edb0bb5634dd',
+  'dart_revision': '3883c6070942e4e3ed8348fbd05d542375166788',
 
   # 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: b4ccb2afd256c7c8aa02f454c7c6ce47
+Signature: 755a48ad5ff76a40c4925ae38e1c16e2
 
 UNUSED LICENSES:
 
@@ -7770,8 +7770,6 @@ FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/native_type.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/native_type.h
 FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/recognized_method.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/recognized_method.h
-FILE: ../../../third_party/dart/runtime/vm/compiler/write_barrier_elimination.cc
-FILE: ../../../third_party/dart/runtime/vm/compiler/write_barrier_elimination.h
 FILE: ../../../third_party/dart/runtime/vm/constants_base.h
 FILE: ../../../third_party/dart/runtime/vm/dispatch_table.cc
 FILE: ../../../third_party/dart/runtime/vm/dispatch_table.h