Remove deprecated API for createAudioDevice.

Blink is calling new API createAudioDevice().
It needs to remove.

TODO(crogers): remove deprecated API as soon as WebKit calls new API.

This patch is related with https://codereview.chromium.org/201303006/

BUG=353110

Review URL: https://codereview.chromium.org/201723003

git-svn-id: svn://svn.chromium.org/blink/trunk@169410 bbb929c8-8fbe-4397-9dbb-9b2b20218538