Fix HeapTest.VectorDestructorsWithVtable test.
Fix HeapTest.VectorDestructorsWithVtable test.

Use Persistent<InlinedVectorObjectWithVtableWrapper> to keep
the object alive in scope.

R=haraken
BUG=none

Review URL: https://codereview.chromium.org/1285563002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@200309 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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