Remove unused NonNullPassRefPtr from WTF

Remove unused NonNullPassRefPtr from WTF
https://bugs.webkit.org/show_bug.cgi?id=82389

Reviewed by Kentaro Hara.

Source/JavaScriptCore:

* JavaScriptCore.order: Remove nonexistent symbols referencing NonNullPassRefPtr.

Source/WTF:

NonNullPassRefPtr seems to be unused since JSC allocation was
restructured in r84052.

If someone decides they need this later, they can always revert this patch.

* wtf/PassRefPtr.h:
* wtf/RefPtr.h:
(RefPtr):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@113794 268f45cc-cd09-0410-ab3c-d52691b4dbfc