Roll src/third_party/dart 385be0cf31..05bba46133 (6 commits)

05bba46133 Use DFS numbering for block dominates test
fba89f9f64 [vm] Don't change the content of the VM isolate's snapshot based on what was loading into a core or app snapshot.
3d3f6f9d4b Remove immediateUnderSetLiteral.
7b86d78f07 Enable set literal lowering in dart2js.
e29835749a [dart_internal] Bump SDK constraint upper-bound to <2.3.0
53ca69ba7e [release] Bump version and update CHANGELOG for 2.2.0

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': '385be0cf31938ebdadba92755bae8e049b840d9a',
+  'dart_revision': '05bba46133f9dd349dac2e83ca3bf81b25c2d749',
 
   # 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: 3f8effa6275dd8795e4b6866c042b476
+Signature: 54c7a95ddf78efb1fdfafc5db3ba46fa
 
 UNUSED LICENSES: