[co19] Roll co19 to 74eec903ea06fa09dc8799b0552d55b581a82996
[co19] Roll co19 to 74eec903ea06fa09dc8799b0552d55b581a82996

2020-08-06 sgrekhov@unipro.ru Fixes 887.LibTest/io/Process* tests migrated to null safety
2020-08-06 sgrekhov@unipro.ru Fixes 876. Migrated HttpClientRequest tests fixed
2020-08-06 sgrekhov@unipro.ru LibTest/convert tests fixed to not to fail on tryjobs
2020-08-05 sgrekhov@unipro.ru Fixes 805. Expect errors instead of warnings according to the changed specification
2020-08-05 sgrekhov@unipro.ru Fixes 885. LibTest\io\Link tests migrated to null safety
2020-08-05 sgrekhov@unipro.ru Fixes 884. LibTest\io\IOSink tests migrated to null safety
2020-08-05 irina.arkhipets@gmail.com Fixes 880: LibTest\typed_data\Float64x2List tests adopted for null safety.
2020-08-04 sgrekhov@unipro.ru operator_right_shift_A01_t01.dart fixed on dart2js
2020-08-04 sgrekhov@unipro.ru CyclicInitializationError tests fixed to expect any Error
2020-08-04 sgrekhov@unipro.ru Fix for 882. LibTest\io\InternetAddress test migrated to null safety
2020-08-04 sgrekhov@unipro.ru Fix for 881. LibTest\io\HttpServer test migrated to null safety

Change-Id: I13743c58a6777843276bb0bb821ee461b7e8a4cf
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/157484
Reviewed-by: William Hesse <a821cddceae7dc400f272e3cb1a72f400f9fed6d@google.com>
Commit-Queue: William Hesse <a821cddceae7dc400f272e3cb1a72f400f9fed6d@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk