Add HashMapWithRefPtrAsKey WTF unit test
Add HashMapWithRefPtrAsKey WTF unit test

This test makes sure that HashMap<RefPtr<X>,Y> owns properly RefPtr key instances.
This test might be useful considering possible refactoring (removal) of HashMap<RefPtr<T>,..> template specialization.

Review URL: https://codereview.chromium.org/32823018

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160368 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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