Roll Dart SDK from 5c59a47beda7 to 902538ea56d5 (2 revisions) (flutter#21978)

Author: skia-flutter-autoroll

DEPS

@@ -34,7 +34,7 @@ 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': '5c59a47beda7af5114881b23a8238aeb99338654',
+  'dart_revision': '902538ea56d5058c901a872415e148e644c46c40',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -52,7 +52,7 @@ vars = {
   'dart_pub_rev': 'f0c7771b38155d3829a60d60b5dba2784b100811',
   'dart_pub_semver_tag': 'v1.4.4',
   'dart_quiver-dart_tag': '246e754fe45cecb6aa5f3f13b4ed61037ff0d784',
-  'dart_resource_rev': 'f8e37558a1c4f54550aa463b88a6a831e3e33cd6',
+  'dart_resource_rev': '6b79867d0becf5395e5819a75720963b8298e9a7',
   'dart_root_certificates_rev': '7e5ec82c99677a2e5b95ce296c4d68b0d3378ed8',
   'dart_shelf_packages_handler_tag': '2.0.0',
   'dart_shelf_proxy_tag': '0.1.0+7',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 9969595ae8de55891d17927142faa8eb
+Signature: b015e7ec07ad3548442fc45952411228
 
 UNUSED LICENSES: