Cleaning up link highlighting FIXMEs

Emergency fix from https://codereview.chromium.org/24376003/ left behind
numerous FIXMEs. This CL cleans up the easy fixes.

BUG=303926

Review URL: https://codereview.chromium.org/25938003

git-svn-id: svn://svn.chromium.org/blink/trunk@159043 bbb929c8-8fbe-4397-9dbb-9b2b20218538