GitLab

This removes the code to control "Headphone" and "Speaker"
elements simultaneously for ARM, and makes us instead just
look for "Master" (x86) or "Digital" (ARM).

BUG=chromium-os:18578
TEST=manual: still works on x86

Review URL: http://codereview.chromium.org/7582024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96402 0039d316-1c4b-4281-b951-d872f2087c98