Roll Dart SDK from 84c3eacc7ba0 to 6eab35f49cbb (2 revisions) (flutter#20913)

Author: skia-flutter-autoroll

DEPS

@@ -34,15 +34,15 @@ 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': '84c3eacc7ba015f14f11336eecd2dd40ee50d468',
+  'dart_revision': '6eab35f49cbb7740f54162e1e57c864b3b0ea06b',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
   'dart_args_tag': '1.6.0',
   'dart_boringssl_gen_rev': '429ccb1877f7987a6f3988228bc2440e61293499',
   'dart_boringssl_rev': '4dfd5af70191b068aebe567b8e29ce108cee85ce',
   'dart_collection_rev': '583693680fc067e34ca5b72503df25e8b80579f9',
-  'dart_dart_style_tag': '1.3.6',
+  'dart_dart_style_tag': '1.3.7',
   'dart_http_retry_tag': '0.1.1',
   'dart_http_throttle_tag': '1.0.2',
   'dart_intl_tag': '0.16.1',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 9da3830d67fb92cff21ca8cbf1c9a324
+Signature: 38135f790d0d98fe61df7551e9ec10ec
 
 UNUSED LICENSES: