Roll src/third_party/dart 991c9da720..ffee99d79b (7 commits)

ffee99d79b Add asyncExpectThrows<T>() to async_helper.
994f535e03 [vm/bytecode/compiler] Remove excessive stack overflow checks when inlining
9ea9612ce8 Object can be used in for-in and await for elements.
4555cf788d Convert one more set of tests
a9ee08051d [dartdevc] Remove redundant parameters from helper methods
1bbd282d65 Make analyzer/tool/summary/generate.dart take an IDL path
f12715354a [co19] DEPS updated

DEPS

@@ -31,7 +31,7 @@ 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': '991c9da7205b512e479283419bcbdc19f1f1f6c2',
+  'dart_revision': 'ffee99d79b1c3d57c24c6b06384d7e14208302af',
 
   # 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: 7836db551ccf7833d0c865f0d2a3cfad
+Signature: 6961e56f8b4a164c0bc30ffadf5292ba
 
 UNUSED LICENSES: