Remove old WebKit urls from webkitpy.

Remove the old WebKit urls, related methods and unittests or update
them.

BUG=none

Review URL: https://codereview.chromium.org/638993002

git-svn-id: svn://svn.chromium.org/blink/trunk@183453 bbb929c8-8fbe-4397-9dbb-9b2b20218538