This CL adds the ability to do encoding/decoding of tokens in the audible range.
It also simplifies the parameters we send in to the whispernet pnacl wrapper.
All the parameters removed are now picked up as defaults in the wrapper itself.
There is literally no reason we'd ever touch those defaults hence it made no
sense to send them hardcoded from wrapper.js.

R=ckehoe@chromium.org
BUG=390393

Review URL: https://codereview.chromium.org/444373004

Cr-Commit-Position: refs/heads/master@{#288374}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288374 0039d316-1c4b-4281-b951-d872f2087c98