Revert "Rebaseline compositing/images/direct-image-dynamic-clip-path.html"

This reverts commit 095f52e20d593fd0ca4d615455ff65b568728112 aka

https://src.chromium.org/viewvc/blink?view=rev&revision=185184

Auto rebaselines landed for that change but the bots did not cycle green.
Seems the mac needs a generic mac port image result, as it won't fallback
to use either the win or generic results. Reverting for now.

TBR=yhirano@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/717113002

git-svn-id: svn://svn.chromium.org/blink/trunk@185202 bbb929c8-8fbe-4397-9dbb-9b2b20218538