Remove hyphen dictionary from WebKitUnitTests isolate file (take 2).

We need to remove this before we can delete the chromium
code.

BUG=None
TBR=ojan@chromium.org

First landing attempt: https://codereview.chromium.org/21124014

Review URL: https://codereview.chromium.org/21581002

git-svn-id: svn://svn.chromium.org/blink/trunk@155343 bbb929c8-8fbe-4397-9dbb-9b2b20218538