Consider merging https://chromium.googlesource.com/chromium/blink/+/dc19721e036c668389d06ec7de8ef9917cc04a29 if the comment below is correct. Update outdated XHR layout test. The explanation in the HTML file says the expected Content-Type is application/xml, but it actually is text/plain. This is correct according to the XHR spec, and application/xml was legacy WebKit behavior. The HTML file also references a WebKit bug that specifies the old behavior, and will be updated to reference a Chromium bug for the correct behavior. The test passed before and will still pass after this test. However, running it manually in the browser will be less confusing.
Webkit GitHub - Test Link - https://github.com/WebKit/WebKit/blob/8afe31a018b11741abdf9b4d5bb973d7c1d9ff05/LayoutTests/http/tests/xmlhttprequest/post-content-type.html Only difference is following lines: <p>Test for <a href="https://bugs.webkit.org/show_bug.cgi?id=3565">bug 3565</a> - posting data via XMLHttpRequest doesn't work (wrong Content-Type).</p> rniwa@webkit.org / ap@webkit.org - Do we need to update this? Thanks!
This was done as part of bug 11049. *** This bug has been marked as a duplicate of bug 11049 ***