Roll src/third_party/dart c8f8c11b70b4..843bd2990881 (5 commits) (#15714

)

https://dart.googlesource.com/sdk.git/+log/c8f8c11b70b4..843bd2990881

git log c8f8c11b70b4..843bd2990881 --date=short --first-parent --format='%ad %ae %s'
2020-01-17 aam@google.com Revert "[i18n] Replaces fuchsia.deprecatedtimezone"
2020-01-17 vsm@google.com use old function syntax on null_test
2020-01-17 vsm@google.com [nnbd] port dart:js_util to nnbd
2020-01-17 fmil@google.com [i18n] Replaces fuchsia.deprecatedtimezone
2020-01-17 jwren@google.com Error handling in completion_metrics.dart - don't attempt to create an AnalysisContextCollection until we have determined that the included path exists on the machine.

Created with:
  gclient setdep -r src/third_party/dart@843bd2990881

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 dart-vm-team@google.com 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: dart-vm-team@google.com

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': 'c8f8c11b70b49f77564de6c4dc85d4de385442cf',
+  'dart_revision': '843bd29908813296923190a78b828595084adb6a',
 
   # 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: 9ab2f329f1834718c231c8bc33e6ab62
+Signature: 36c16cb51bd27b35b207ef17101dc705
 
 UNUSED LICENSES:
 
@@ -7757,8 +7757,6 @@ LIBRARY: dart
 ORIGIN: ../../../third_party/dart/benchmarks/ListCopy/dart/ListCopy.dart + ../../../third_party/dart/LICENSE
 TYPE: LicenseType.bsd
 FILE: ../../../third_party/dart/benchmarks/ListCopy/dart/ListCopy.dart
-FILE: ../../../third_party/dart/runtime/vm/field_table.cc
-FILE: ../../../third_party/dart/runtime/vm/field_table.h
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_dev_runtime/patch/js_patch.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/js_patch.dart
 FILE: ../../../third_party/dart/sdk_nnbd/lib/_internal/js_dev_runtime/patch/js_patch.dart