Roll src/third_party/dart 492df72739..9b5eabdaca (8 commits)

9b5eabdaca Fix crash in color support
a533753bec Remove --fast-startup flag support from testing scripts and status files
5f10aed19c [Kernel] Don't print static fields in instance constants
bdb51e2837 Improve input path handling and remove extra schemas.
0604110806 Reduce expectations on thrown exception
966e007b63 Pass CallStructure on dynamic and static use in ResolutionWorldBuilder
3e7801294e Remove unneeded code in OrderedTypeSet
8a91948c03 [Kernel] Properly signal compilation errors for constants

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': '492df72739acb4e1c135d34eb75dfd676caa45ba',
+  'dart_revision': '9b5eabdaca5dd8af1c5f0e65c04e11ec3e4f88d7',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py