Looks like <http://trac.webkit.org/changeset/155615> may be our first ever test for PDF in subframe, and so it's causing the same issue that Tim fixed for PDF as image in bug 120963. Lots of completely unrelated tests are failing:
run-webkit-tests fast/history/history-back-while-pdf-in-pagecache.html fast/multicol/newmulticol --child-processes=1 --no-retry-failures
I'm looking at this.
Created attachment 211472 [details]
Comment on attachment 211472 [details]
Clearing flags on attachment: 211472
Committed r155683: <http://trac.webkit.org/changeset/155683>
All reviewed patches have been landed. Closing bug.