Track cellular badge in icon cache.
Track cellular badge in icon cache.

BUG=chromium-os:18103
TEST=See issue. Test network icons in status area, network menu, and internet options page, 3g in particular.

Review URL: http://codereview.chromium.org/8207009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@105629 0039d316-1c4b-4281-b951-d872f2087c98

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