Check WTF::Vector size with '0' inline capacity
Check WTF::Vector size with '0' inline capacity

Putting in place compile assertion that had been removed with r155270.

Review URL: https://chromiumcodereview.appspot.com/21549002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@155671 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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