[cros] Add network menu item text for Mobile Data top-up URL. Remove unused carrier deal notification text.
[cros] Add network menu item text for Mobile Data top-up URL.
Remove unused carrier deal notification text.

BUG=chromium-os:14575
TEST=None.

Review URL: http://codereview.chromium.org/6905129

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@83865 0039d316-1c4b-4281-b951-d872f2087c98

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