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and check them to see if audio processing should be applied.
Previously this check was just being based on a device id being
empty or not, which doesn't do the right thing for WebAudio.

BUG=277134

Review URL: https://chromiumcodereview.appspot.com/23171026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220617 0039d316-1c4b-4281-b951-d872f2087c98