Media files served without an extension will not load in <video> tag.
rdar://problem/19759913
<rdar://problem/31159539>
Created attachment 304964 [details] Patch
Created attachment 305015 [details] Patch for landing
Comment on attachment 305015 [details] Patch for landing Clearing flags on attachment: 305015 Committed r214269: <http://trac.webkit.org/changeset/214269>