[Webkit-unassigned] [Bug 198298] REGRESSION (r245756) [Mac] 2 TestWebKitAPI.DownloadProgress* and TestWebKitAPI._WKDownload.DownloadMonitorCancel are flaky timeouts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198298

--- Comment #3 from Ryan Haddad <ryanhaddad at apple.com> ---
TestWebKitAPI.DownloadProgress.CancelDownloadWhenProgressIsCanceled is asserting on Mojave debug:

    TestWebKitAPI.DownloadProgress.CancelDownloadWhenProgressIsCanceled
        _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
        ASSERTION FAILED: m_downloads.contains(download.downloadID())
        SHOULD NEVER BE REACHED
        /Volumes/Data/slave/mojave-debug/build/Source/WebKit/NetworkProcess/Downloads/DownloadManager.cpp(174) : void WebKit::DownloadManager::downloadFinished(WebKit::Download &)
        /Volumes/Data/slave/mojave-debug/build/WebKitBuild/Debug/DerivedSources/WebKit2/NetworkProcessProxyMessageReceiver.cpp(314) : void WebKit::NetworkProcessProxy::didReceiveNetworkProcessProxyMessage(IPC::Connection &, IPC::Decoder &)

https://build.webkit.org/builders/Apple%20Mojave%20Debug%20WK2%20(Tests)/builds/2782/steps/run-api-tests/logs/stdio

I can reproduce locally with a debug build and the following command:
run-api-tests DownloadProgress.LoseProgressWhenDownloadIsCanceled --iterations 25

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