Roll src/third_party/dart b52d264f5b2f..05e70d5b38cb (17 commits)

[skia-flutter-autoroll]

https://dart.googlesource.com/sdk.git/+log/b52d264f5b2f..05e70d5b38cb

git log b52d264..05e70d5 --date=short --first-parent --format='%ad %ae %s'
2019-12-30 whesse@google.com [infra] Add unapproved failures test to builder status script
2019-12-30 zichangguo@google.com [vm/io] add endian.host to RawSocketOption.fromInt
2019-12-30 srawlins@google.com analyzer: move tests for 10 error codes to separate files
2019-12-30 srawlins@google.com analyzer: Fix duplicate error-reporting with duplicate field formals
2019-12-30 srawlins@google.com analyzer: move 'non-error' tests for 12 codes to separate files
2019-12-30 scheglov@google.com Remove reporting duplicate CompileTimeErrorCode.CONST_NOT_INITIALIZED from ConstructorFieldsVerifier.
2019-12-30 devoncarew@google.com [analyzer] improve the cursor insertion position for required params
2019-12-30 scheglov@google.com Simplify SyntheticIdentifier to partial SimpleIdentifier.
2019-12-30 scheglov@google.com Remove 'referencingLibrary' from several Scope.lookupX() methods.
2019-12-29 scheglov@google.com Add canReferenceElementWithoutThisPrefix() to LinterContext.
2019-12-29 devoncarew@google.com [analyzer] fix an issue with the missing_required_param warning ending in two periods
2019-12-29 brianwilkerson@google.com Add a fix for prefer_if_null_operators
2019-12-29 devoncarew@google.com [analyzer] insert missing params before child/children
2019-12-28 paulberry@google.com Migration: teach FixBuilder to add the required keyword when necessary.
2019-12-28 mfairhurst@google.com [nnbd_migration] Handle invokeType on function invocation expression
2019-12-28 brianwilkerson@google.com Enable unnecessary_this in several packages
2019-12-28 brianwilkerson@google.com Update the generators to not generate unnecessary uses of "this"

Created with:
gclient setdep -r src/third_party/dart@05e70d5b38cb

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

[skia-flutter-autoroll]

Auto-roller completed checks. About to merge.