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According to UX mock, audio settings button shown on the right of volume
slider is wide and has both headset icon and expand icon.

Screenshot: http://screen/ei2trCkJcSA
UX mock: http://shortn/_EMpEzaBIUx

TEST=manual
BUG=860600

Change-Id: I477243e757632881dc6ac9043838ebcfafcb69b4
Reviewed-on: https://chromium-review.googlesource.com/1141678Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577378}