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The tests for StatusAreaView, PowerMenuButton, and
CapsLockMenuButton were crashing when they tried to get the
StatusAreaView from chromeos::BrowserView, which isn't used
in Aura builds.  This change makes them instead get the
status area from the Aura shell.

BUG=103501,103495,104666
TEST=ran tests

Review URL: http://codereview.chromium.org/8591003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111006 0039d316-1c4b-4281-b951-d872f2087c98