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On Android, pages may be shown from a downloaded offline cache. In this
case, the security chip text and icon change. Reflect this in
ToolbarModel.

With this new ability, render the Offline security information in VR.

BUG=735770

Review-Url: https://codereview.chromium.org/2968143003
Cr-Commit-Position: refs/heads/master@{#485520}