Roll src/third_party/dart 5cce1e4acd..d5d889668b (17 commits) (#13806)

dart-lang/sdk@d5d889668b [analyzer] Added variance support for upper/lower bounds.
dart-lang/sdk@a65aff122d [analyzer] Changed subtype checking for variance modifiers.
dart-lang/sdk@a520e771f6 More subtyping tests.
dart-lang/sdk@942419e6ba [analysis_server] Funnel sendServerErrorNotification through logException
dart-lang/sdk@26cabb72c3 [analyzer] Add [SilentException] where previously not reported to users.
dart-lang/sdk@d355778418 [analyzer] rate limit the crash reports we send
dart-lang/sdk@0b210e5e81 strict inference should not complain about top-level setter return types
dart-lang/sdk@ab7bceb622 Ensure that Member(s) are not created around Member(s).
dart-lang/sdk@b3d52df66d Remove undetected unused field in CreateAllSummariesVisitor
dart-lang/sdk@158559bc03 Changelog update for extension method prefix change.
dart-lang/sdk@2563a1b2ac Add an option to dartfix to specify the SDK used by analysis
dart-lang/sdk@667f77ed60 Add an http server for the interactive preview mode
dart-lang/sdk@2a9af7d953 [vm] Late modifier for non-final static fields.
dart-lang/sdk@3771dddf43 [VM/nnbd] Force the DeclarationType of a class to have legacy nullability.
dart-lang/sdk@024a4b2999 Remove unused import
dart-lang/sdk@3bde76208d Fix for AstBinaryFlags.hasQuestion
dart-lang/sdk@63c67a6768 Ignore zero length regions in the preview tool

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': '5cce1e4acde9c166877a0c1a142e0cb458964478',
+  'dart_revision': 'd5d889668b1761c659936df98571cd7c53a11e1e',
 
   # 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

-Signature: 0711148b858bd9d47c7b0cc7bcf967e7
+Signature: 80ec515c59d3950b04c99471b0fdbfe2
 
 UNUSED LICENSES: