Always use settings UI for mobile network.
Always use settings UI for mobile network.

This is because native UI is not complete and only settings UI
contains all the logic.

BUG=chromium-os:9431
TEST=Verify only settings UI shows up for mobile network per chromium-os:9431.

Review URL: http://codereview.chromium.org/5338007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@67574 0039d316-1c4b-4281-b951-d872f2087c98

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