Roll Dart to 5b56dfb77a76e9d8021086c0684b1e8bd9dbca9a. (flutter#4521)

rmacnak-google · web-flow · commit 6a724f0d3e22 · 2018-01-05T14:15:47.000-08:00
diff --git a/DEPS b/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': '8d7219a5b6a7c2505ff57f23e7cf80da4c724512',
+  'dart_revision': '5b56dfb77a76e9d8021086c0684b1e8bd9dbca9a',
 
   'dart_args_tag': '0.13.7',
   'dart_async_tag': '2.0.2',
diff --git a/travis/licenses_golden/licenses_third_party b/travis/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 3a8d1c1f2b8ab6b98a05585750bfed02
+Signature: 8327cee9190be96f4395b44b1c6b581b
 
 UNUSED LICENSES:
 
