Track connected network to display correct VPN icon.
Track connected network to display correct VPN icon.

Change-Id: I159d13403a2be558432a3187c63a2ecf3a79ea0c

BUG=chromium-os:19107
TEST=See issue

Review URL: http://codereview.chromium.org/8100002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@103744 0039d316-1c4b-4281-b951-d872f2087c98

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