Roll src/third_party/dart 94a4f6415e6c..c547f5d933e5 (9 commits) (flutter#14812)

https://dart.googlesource.com/sdk.git/+log/94a4f6415e6c..c547f5d933e5

git log 94a4f6415e6c..c547f5d933e5 --date=short --first-parent --format='%ad %ae %s'
2019-12-27 [email protected] Enable prefer_generic_function_type_aliases in most of the packages
2019-12-26 [email protected] [ VM / dart:io / Service ] Add service extension RPCs to dart:io to allow for HttpClient.enableTimelineLogging to be set remotely.
2019-12-26 [email protected] Extract TypeNameResolver.
2019-12-26 [email protected] [ dartfuzz ] Fix update_spreadsheet.py so it can be run from any directory.
2019-12-26 [email protected] [ package:vm_service ] Added support for dart:io service extensions
2019-12-26 [email protected] Move ResolverErrorCode codes into CompileTimeErrorCode.
2019-12-26 [email protected] Extract TypeProvider class into lib/dart/element/type_provider.dart file
2019-12-26 [email protected] Remove unused InstanceFieldResolverVisitor.
2019-12-26 [email protected] [dartdevc] Adding nullability check to is expressions.

Created with:
  gclient setdep -r src/third_party/dart@c547f5d933e5

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC [email protected] on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: [email protected]

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': '94a4f6415e6c1e96175168fb134491a9acc6923f',
+  'dart_revision': 'c547f5d933e5a10e18b1b26b54a6249e88fa0f1c',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: 05f64395a411607b1226e5384bcfa2a3
+Signature: 3c59d94b10780bdc2b63db4395a53f0f
 
 UNUSED LICENSES: