Added missing export declarations to WTF print facilities.

R=tkent@chromium.org
BUG=

Review URL: https://codereview.chromium.org/444493004

git-svn-id: svn://svn.chromium.org/blink/trunk@179536 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove cachedSizeForOverflowClip()

We don't need any more callers of this method which returns stale and
confusing information when used in the wrong phase. Lets just inline
the value it returns and add the asserts to the right spots.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/439413002

git-svn-id: svn://svn.chromium.org/blink/trunk@179537 bbb929c8-8fbe-4397-9dbb-9b2b20218538