Roll src/third_party/dart d5d889668b..ffbd2eb7ee (15 commits)

dart-lang/sdk@ffbd2eb7ee Address comments from an earlier CL
dart-lang/sdk@7c71115b28 Remove unused type parameter from VariableMember.
dart-lang/sdk@cd22f16f0b Fix crash when building //utils/dartdevc:dartdevc_kernel_sdk.
dart-lang/sdk@f443bc918e [cfe] Add tests for inheritance from opt-out libraries
dart-lang/sdk@6ed0fcaa12 [analysis_server] Remove last dependency on front_end+kernel
dart-lang/sdk@2b94bd678d [CFE] Fix renames from test to suite and move of parser
dart-lang/sdk@d4f1512e00 [cfe] Support forEffect and readOnlyReceiver in IndexSet
dart-lang/sdk@082c10aab7 Revert "[VM/nnbd] Pass nullability when creating Class::DeclarationType."
dart-lang/sdk@b4779e8f72 Revert "[VM/nnbd] Make Nullability and NNBDMode class enums to avoid name conflicts."
dart-lang/sdk@82aa7e79af Revert "[VM/nnbd] Force the DeclarationType of a class to have legacy nullability."
dart-lang/sdk@a7472ba4c6 Cache value of "non-nullable" flag so it can be used in the VM code without having to search through the array of experimental flags array.
dart-lang/sdk@8938a5ed2d Migration: make an edge origin for assignments of dynamic.
dart-lang/sdk@c9ef7cc5e3 Deprecate Member.baseElement, use Element.declaration in analyzer.
dart-lang/sdk@3793a40e6a Migration: stop using `always` for decorating the type of explicit `null`s.
dart-lang/sdk@12265c4e42 Hacky prototype of how to fix the seventh item from flutter#39247

Author: bkonyi

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': 'd5d889668b1761c659936df98571cd7c53a11e1e',
+  'dart_revision': 'ffbd2eb7eebf569b8aefd970cf59851aaf2869a3',
 
   # 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: 80ec515c59d3950b04c99471b0fdbfe2
+Signature: a239f867d1db8832be8d121f7ff5903a
 
 UNUSED LICENSES: