Profiles: Fixed crash when avatar bubble is launched using ctrl+shift+m key press when there is only one default profile. Incorporated necessary condition check before launching avatar bubble.
Profiles: Fixed crash when avatar bubble is launched using ctrl+shift+m key press when there is only one default profile. Incorporated necessary condition check before launching avatar bubble.

BUG=105700
TEST=None


Review URL: http://codereview.chromium.org/8664028

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@112864 0039d316-1c4b-4281-b951-d872f2087c98

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