Repair early return when the matched properties cache is hit

This was accidently removed in r325799 [1]. The structure of the code made this
hard to detect in review :(

[1] https://src.chromium.org/viewvc/blink?view=rev&revision=163497

BUG=327454

Review URL: https://codereview.chromium.org/112053003

git-svn-id: svn://svn.chromium.org/blink/trunk@163678 bbb929c8-8fbe-4397-9dbb-9b2b20218538