Tab audio indicator tweaks

Tab audio indicator tweaks

Some small tweaks to the tab audio indicator:
  - change the icon to be half the size (4 bars instead of 8 bars)
  - draw 2 columns instead of 3
  - draw the icon at the bottom right
  - clip the favicon so that it doesn't obscure the equalizers

screenshot: http://i.imgur.com/csAXHDx.png

BUG=3541
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=191068

[sail, 2013-03-25 02:43:49]

Carlos, let me know what you think. I think we can change things some more.
Thanks.

[sail, 2013-03-25 23:55:37]

Fixed Views issue. Please take a look.
sky: chrome/browser/ui/* OWNERS
cpu: audio indicator logic

[sky, 2013-03-25 23:57:05]

LGTM

[cpu_(ooo_6.6-7.5), 2013-03-26 02:15:59]

lgtm

[commit-bot: I haz the power, 2013-03-27 18:30:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sail@chromium.org/13055002/5001

[commit-bot: I haz the power, 2013-03-28 00:03:01]

Change committed as 191068