Do not remove webkitpy prefix from test failures. Removing the prefix might increase readability (shorter text), but in case someone copy-paste the test name and tries to run it, it wouldn't run, and might be hard to debug. We should not alter the name of the test while displaying it. Also see https://bugs.webkit.org/show_bug.cgi?id=207106#c14
Created attachment 389673 [details] Patch
Committed r255684: <https://trac.webkit.org/changeset/255684>
<rdar://problem/59153777>
Deployed on production server.