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These tests had several issues. The fixes are aimed to reduce flakiness and remove invalid configurations where tests are not providing any value. Some of the issues include: * some tests interferered with each other causing a 18% flakiness rate in chrome: they used a common file system that ended up being shared in a single browser instance. This is why some tests failed when they find a file exists before it was created [1]. * some tests were not properly using async_helper/async_minitest, so they may complete before they finish executing * DDC no longer supports these APIs due to https://github.com/dart-lang/sdk/issues/53864. We don't intend to fix those issues, so there is no purpose in running these tests in DDC at this time. [1]: https://logs.chromium.org/logs/dart/buildbucket/cr-buildbucket/8766313714239949697/+/u/test_results/ignored_flaky_test_failure_logs Change-Id: I1dbb28eba2d962000a4d425563dbc1eb6b55dbed Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/332266 Commit-Queue: Sigmund Cherem <sigmund@google.com> Reviewed-by: Srujan Gaddam <srujzs@google.com>