Add pluginNPP() for Chrome-side code to override, to allow crrev.com/15007012 to land.
Add pluginNPP() for Chrome-side code to override, to allow crrev.com/15007012 to land.

BUG=152006

Review URL: https://chromiumcodereview.appspot.com/14672046

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150548 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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