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Just show the setting level bubble on the default monitor, since ChromeOS only really supports one monitor right now anyway.

Code like this will end up living in aura_shell::Shell by the time we end up figuring out how to support multiple monitors.

For now, this removes a USE_AURA ifdef/NOTIMPLEMENTED() and some unnecessary complexity for cros.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/8596013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110764 0039d316-1c4b-4281-b951-d872f2087c98