[co19] Roll co19 to 306f82e85b3d9e596eed38d36cbef369643515c0

2023-11-10 [email protected] dart-lang/co19#2361. Improve some flaky tests on Web (dart-lang/co19#2364)
2023-11-10 [email protected] dart-lang/co19#2350. Add more factory constructor tests. Part 3 (dart-lang/co19#2363)
2023-11-09 [email protected] dart-lang/co19#2349. Add more tests for constant constructors of the extension types (dart-lang/co19#2352)
2023-11-09 [email protected] Fixes dart-lang/co19#2361. Fix flaky tests on web-platforms (dart-lang/co19#2362)
2023-11-08 [email protected] dart-lang/co19#2359. Update tests according to the new nullability rules. Part 1 (dart-lang/co19#2360)
2023-11-07 [email protected] Fixes dart-lang/co19#2356. Fix return type of `this` (dart-lang/co19#2358)
2023-11-07 [email protected] dart-lang/co19#2350. Update existing factory constructor tests. Part 2 (dart-lang/co19#2357)
2023-11-03 [email protected] Fixes dart-lang/co19#2339. Add tests that extension can't have name `type` (dart-lang/co19#2340)
2023-11-03 [email protected] dart-lang/co19#2346. Add expected error in analyzer (dart-lang/co19#2347)

Change-Id: I6c0e1e9612dc4a0e21c4d506fa682ae1e9b98ea9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/335461
Reviewed-by: Erik Ernst <[email protected]>
Reviewed-by: Alexander Thomas <[email protected]>
Commit-Queue: Alexander Thomas <[email protected]>

Author: sgrekhov

DEPS

@@ -55,7 +55,7 @@ vars = {
 
   # co19 is a cipd package. Use update.sh in tests/co19[_2] to update these
   # hashes.
-  "co19_rev": "cee2c7fe253fa70df29f28e7610a824800a477c5",
+  "co19_rev": "306f82e85b3d9e596eed38d36cbef369643515c0",
   # This line prevents conflicts when both packages are rolled simultaneously.
   "co19_2_rev": "d87f9096ec0a14cd7c32c33316fb2378b89d6a45",