Roll src/third_party/dart d45c3d15cb..7408ed4730 (20 commits) (#13778)

dart-lang/sdk@7408ed4730 Added null-check selector to syntax of cascades, and test.
dart-lang/sdk@6f70d7f5a3 Revert "[vm] Remove obsolete kernel constant expression evaluator."
dart-lang/sdk@96822518f9 [frontend_server] Add reproduction test of incremental serializer bug
dart-lang/sdk@64b0bfac68 [infra] Update CHANGELOG.md for 2.6.1
dart-lang/sdk@4a661e19e2 [cfe] Remove type_promotion_look_ahead_listener.dart
dart-lang/sdk@12c92332f8 [CFE] Parser test can run scanner in non-nnbd-mode
dart-lang/sdk@684c456ffc [cfe] Remove reify runtime
dart-lang/sdk@e8de03915b [vm] Remove obsolete kernel constant expression evaluator.
dart-lang/sdk@0e9eadcb71 Upgrade pub revision
dart-lang/sdk@48f0b83ff2 [CFE] Allow ! in cascade
dart-lang/sdk@cf2a474438 [CFE] Fix incremental serialization bug caused by missing parameter passing
dart-lang/sdk@a7a54afbaa [cfe] Support failure log printing in unit_test_suites
dart-lang/sdk@bbdb7860f6 [build]: Build on Arch Linux with python 2.7-3.8
dart-lang/sdk@64e65a7dab [dart2js] new-rti: Use local in setting up type$
dart-lang/sdk@8f1be54906 [dart2js] New RTI: Improve normalization of is-tests.
dart-lang/sdk@1b344fc77e [dartfuzz] Add fuzzer support for extension methods for classes
dart-lang/sdk@ed956daa3f Update the DDC dart:async patch file version to match the migrated lib.
dart-lang/sdk@be2866b9b1 [analyzer] update lib/crash_reporting.dart
dart-lang/sdk@8ca18f1a14 Extension method prefixed import tests.
dart-lang/sdk@750a83b896 [dartdevc] Fix crash when source files contain non-UTF8 characters

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': 'd45c3d15cb3cea0104a87697c085259666eec528',
+  'dart_revision': '7408ed473006eeb41e23b9b21d2f5544bdd22b7b',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -78,7 +78,7 @@ vars = {
   'dart_pedantic_tag': 'v1.8.0',
   'dart_pool_tag': '1.3.6',
   'dart_protobuf_rev': '3746c8fd3f2b0147623a8e3db89c3ff4330de760',
-  'dart_pub_rev': '80ac76400ff58fde3c5a335d860d196c3febe837',
+  'dart_pub_rev': 'd15067931a6b671a1c9dcc98b5923347676269cf',
   'dart_pub_semver_tag': '1.4.2',
   'dart_quiver-dart_tag': '2.0.0+1',
   'dart_resource_rev': 'f8e37558a1c4f54550aa463b88a6a831e3e33cd6',

ci/licenses_golden/licenses_third_party

-Signature: 9355024c19864ce227141256962ef660
+Signature: c56797567c2eb8b80b7d17fddc26d426
 
 UNUSED LICENSES: