Roll Dart SDK from 70c7daa78288 to f9e1d1ab4001 (1 revision) (#23938)

DEPS

diff --git a/DEPS b/DEPS
index 478aed9..e334bf3 100644
--- a/DEPS
+++ b/DEPS
@@ -35,7 +35,7 @@
   # 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': '70c7daa78288e213860dc8a826a49a52385a9333',
+  'dart_revision': 'f9e1d1ab40015ad8ec7132b4b476bb2c39ed0757',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -50,7 +50,7 @@
   'dart_linter_tag': '0.1.129',
   'dart_oauth2_tag': '1.6.0',
   'dart_protobuf_rev': '0d03fd588df69e9863e2a2efc0059dee8f18d5b2',
-  'dart_pub_rev': '0402c467547daa5886352cb315338ae54552d21c',
+  'dart_pub_rev': '0e657414a472e74ca5dd76ae0db50cc060251dec',
   'dart_resource_rev': '6b79867d0becf5395e5819a75720963b8298e9a7',
   'dart_root_certificates_rev': '7e5ec82c99677a2e5b95ce296c4d68b0d3378ed8',
   'dart_shelf_packages_handler_tag': '2.0.0',

ci/licenses_golden/licenses_third_party

diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
index 2752254..883d276 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 6234763fbb4722552696f2792fba66d7
+Signature: 21636d7d2a92725d05cd465ff4a3347b
 
 UNUSED LICENSES: