Roll Dart SDK from 92782d2 to 84c3eac (1 revision) (#20906)

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': '92782d2b94b53b9e3982c7bbcddf65b86a5a7446',
+  'dart_revision': '84c3eacc7ba015f14f11336eecd2dd40ee50d468',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -187,10 +187,10 @@ deps = {
    Var('dart_git') + '/crypto.git@f7c48b334b1386bc5ab0f706fbcd6df8496a87fc',
 
   'src/third_party/dart/third_party/pkg/csslib':
-   Var('dart_git') + '/csslib.git@451448a9ac03f87a8d0377fc0b411d8c388a6cb4',
+   Var('dart_git') + '/csslib.git@166d3e07eabc8283c6137cfde17fb25b8bb40080',
 
   'src/third_party/dart/third_party/pkg/dart2js_info':
-   Var('dart_git') + '/dart2js_info.git@94ba36cb77067f28b75a4212e77b810a2d7385e9',
+   Var('dart_git') + '/dart2js_info.git@0632a623b08e1f601c7eba99e0186a581ae799e9',
 
   'src/third_party/dart/third_party/pkg/dartdoc':
    Var('dart_git') + '/dartdoc.git@291ebc50072746bc59ccab59115a298915218428',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 9892b1d8bd99e4dfb966e4dae005e274
+Signature: 9da3830d67fb92cff21ca8cbf1c9a324
 
 UNUSED LICENSES: