Roll src/third_party/dart 82c8c78739..b48c8b1d1c (5 commits) (#9021)

b48c8b1d1c [vm] Re-order ICData entries to allow CID and count to be accessed with a load-pair.
959e7df20e Remove 'await null' in build mode.
59381cd8d0 Fix summary2 linking when using API summaries, which don't include line starts.
59bcb38db7 Report the missing library in LinkedElementFactory.
f9402d635a [vm] Get script of closure from owner as parent function may contain wrong script

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': '82c8c78739f3fd40f91836bf0dd71d6e073a6627',
+  'dart_revision': 'b48c8b1d1c9050734c0491f4e36b7d61ef005233',
 
   # 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: 2a9a83431e1f8122428e5dc46da4a517
+Signature: c3f9cefe27a833f83027c2b801e508ac
 
 UNUSED LICENSES: