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


Review URL: https://chromiumcodereview.appspot.com/13055002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@191068 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed