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This fixes some bugs where we forgot to issue completion callbacks in some
error cases in the proxy, and cleans up the cases that were already doing this
properly.

This removes the PPB_AudioTrusted_API and folds those functions into the
regular Audio API. I'm trying to merge more things to have a smaller explosion
of APIs and the boilerplate associated with them.
Original review URL: http://codereview.chromium.org/7551032
Review URL: http://codereview.chromium.org/7585025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95859 0039d316-1c4b-4281-b951-d872f2087c98