Second part of fix of issue http://code.google.com/p/chromium/issues/detail?id=3285. A NPObject can be called as a construct if it implements NPN_Construct, and NOT implements NPN_InvokeDefault. Otherwise, NPN_InvokeDefault is called even when the object is called as a constructor.
Second part of fix of issue http://code.google.com/p/chromium/issues/detail?id=3285.
A NPObject can be called as a construct if it implements NPN_Construct, and NOT implements
NPN_InvokeDefault. Otherwise, NPN_InvokeDefault is called even when the object is called
as a constructor.

Review URL: http://codereview.chromium.org/56167

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@15029 0039d316-1c4b-4281-b951-d872f2087c98

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