editing/deleting/regional-indicators.html was introduced in http://trac.webkit.org/changeset/93068 and fails since introduction. Alexey says that this is an minor bug in the handling of these characters in the Chromium port.
I've taken another look, and now I'm wondering about why this test doesn't fail elsewhere. The fixed code is under #if PLATFORM(MAC), and cross-platform fallback certainly returns a wrong result for that case. There seems to be more difference between platforms than I thought.
It fails on GTK and Qt too.
I skipped it for Qt in http://trac.webkit.org/changeset/93088.
Skipped for Chromium in http://trac.webkit.org/changeset/93075
This test is also timing out on Chromium Linux dbg bots due to an assertion failure. See http://build.chromium.org/p/chromium.webkit/builders/Webkit%20Linux%20%28deps%29%28dbg%29%281%29/builds/9926 Added TIMEOUT expectation with http://trac.webkit.org/changeset/93099
The test is still failing on Qt.
Expectations look good now.