Use placement new to initialize the persistent in V8NPObject
Use placement new to initialize the persistent in V8NPObject

We just allocate some chunk of memory and reinterpret_cast it to
V8NPObject. We still need to properly construct the persistent inside of
it.

BUG=324225
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/96613005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@162905 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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