Roll src/third_party/dart 9b5eabdaca..f701e11756 (10 commits)

f701e11756 [ VM / Debugger ] Fix issue where a 'Step' command issued when there's no stack caused a crash.
c5bfccc6fb Make downloading the LSP spec a flag and commit the version parsed locally
dbeec3bbf3 Fix formatting in generated LSP file header
bfe15d87d8 Fix LSP exceptions serializing ResponseErrors with Uris
7984dc4fcc Prepare to publish analyzer version 0.34.2.
4b1b2f9176 Switch LSP formatter to not fetch resolved ASTs that aren't used
5ce5d697da Implement LSP code folding
b47524d5b0 Ensure all unhandled exceptions are recorded on the server
8ba2de2344 Sort context for conflicting inherited members
215f6620e7 [Kernel] Signal errors on static fields in constant contexts

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': '9b5eabdaca5dd8af1c5f0e65c04e11ec3e4f88d7',
+  'dart_revision': 'f701e11756967f10cde8216ecfad92b7b53e44f4',
 
   # 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: f10ccfa0ee71f5ec4e8bb5296ee874da
+Signature: 3ac260e2ae1f1fb37878ec331ea4e3ac
 
 UNUSED LICENSES: