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This was left over from the transition to the IRT library: it is to
make the audio thread work when libppruntime is linked into the user
nexe (which is no longer supported) rather than into the IRT.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=1691
TEST=run_ppapi_ppb_audio_browser_test (only run on Mac, not Windows or Linux)

Review URL: https://chromiumcodereview.appspot.com/10824171

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150052 0039d316-1c4b-4281-b951-d872f2087c98