am a0e762ca: free the NPObject in NPP_Destroy.

Merge commit 'a0e762caeaca275ed8390e9ee1cfb5e9149e07b7' into eclair-mr2-plus-aosp

* commit 'a0e762caeaca275ed8390e9ee1cfb5e9149e07b7':
  free the NPObject in NPP_Destroy.