Remove unused NPAPI pieces.
Remove unused NPAPI pieces.

These files were used by the NPAPI plugin which is no longer supported.

BUG= nacl1558
TEST= bots
Review URL: http://codereview.chromium.org/6854003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@4868 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client