Update plugin registration to new APIs.
Update plugin registration to new APIs.

NaCl's side of Chrome's commit 70972.

Patch by Evan Martin.

BUG=23581
TEST=none

Review URL: http://codereview.chromium.org/5986023

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@4121 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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