[chromium] Mark unreachable-overflow-rtl-bug as failing after r103245.
https://bugs.webkit.org/show_bug.cgi?id=74881

Unreviewed gardening.

Also, make expectation file pass linting.

* platform/chromium/test_expectations.txt:

git-svn-id: svn://svn.chromium.org/blink/trunk@103259 bbb929c8-8fbe-4397-9dbb-9b2b20218538