Roll src/third_party/dart 73fdf19b56..077795b3e5 (15 commits) (#14068)

dart-lang/sdk@077795b3e5 [co19] Add .gitignore to new co19 directory
dart-lang/sdk@8d874a5bd8 [cfe] Avoid cascading errors from part versioning mismatch
dart-lang/sdk@cd229de42b [cfe] Increase unit test suites time out to 15 minutes
dart-lang/sdk@4ba61bbbbc Fix exception in ML ranking (issue 39537)
dart-lang/sdk@1069289aeb [ package:vm_service ] Raise an RPCError exception instead of a String exception for in-flight requests that have been canceled via VmService.dispose
dart-lang/sdk@3204295ce1 [analyzer] send the plugin name with crash reports
dart-lang/sdk@507bdd583c Revert "[ VM / Service ] Add --object-id-ring-size to unblock UX studies for memory profiling"
dart-lang/sdk@98d1e99986 Relax UP for required named parameters.
dart-lang/sdk@764c07ec38 [vm] Fix late_modifier_final_field_test in AST mode
dart-lang/sdk@0bbcf079f3 Issue 39532. Support for question mark in typedef generic function type.
dart-lang/sdk@6f8fa3cbb3 Fix an NPE when using ml without available suggestions (issue 39535)
dart-lang/sdk@a17809ad18 [kernel] Add TypeEnvironment.forInElementType
dart-lang/sdk@ba222dac23 [vm] Fix late_modifier_non_final_field_test in AST mode
dart-lang/sdk@e56857fcce Stop using FeatureSet in TypeSystem.
dart-lang/sdk@eddfaff322 Issue 39509. Support for configurable imports in AnalysisDriver.

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': '73fdf19b5644b94447e8d489eb17955cc48fad67',
+  'dart_revision': '077795b3e527bb4868f46ca1b0f52e6ac645e069',
 
   # 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: 29612380ad0a4881092ca5b0f0638f18
+Signature: 4ce27405521b707b43c2d0e6efdc8d5b
 
 UNUSED LICENSES: