Fix Hashtable CTS test

The test assumed that the Enumeration returned from
element() and keys() could be cast to Iterator. Even if it was
previously ok, it isn't now and it is not part of the public
API.

Manual merge from aosp/master for klp-modular-dev.

(cherry-pick of commit 4df29e1e1cf169ff6c77b8dd247de8c79b81d552
from aosp/master)

Bug: 13747624
Change-Id: Ifc3acc0e70bad561f8d9aa443494b40ba0e37346
1 file changed