Remove QuickTime classid quirk.

This is a non-standard site-specific quirk for Mac OS X Wiki Server.
And NPAPI is going away soon anyway.

This was added three years ago in WebKit:
https://bugs.webkit.org/show_bug.cgi?id=61229

BUG=396290

Review URL: https://codereview.chromium.org/414443006

git-svn-id: svn://svn.chromium.org/blink/trunk@178756 bbb929c8-8fbe-4397-9dbb-9b2b20218538