Support WTF::ListHashSet<OwnPtr>

This patch does the following:
- introduces support for ListHashSet<OwnPtr>
- introduces ListHashSet::take() and ListHashSet::takeFirst() methods in order to avoid deletion of the holded pointer at the container destructor
- introduces a unit test for the newly added ListHashSet functionality
- removes 'deleteAllValues(ListHashSet)' function and makes its clients use ListHashSet<OwnPtr> instead

Review URL: https://codereview.chromium.org/283813005

git-svn-id: svn://svn.chromium.org/blink/trunk@174196 bbb929c8-8fbe-4397-9dbb-9b2b20218538