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have any content

Currently only a small subset of 4xx and 5xx HTTP errors show a net error
interstitial when the server responds with no content. This CL adds 
generic messaging for the other cases.

Bug: 632778
Change-Id: If39bf0ba1c89ac5e2b5a27f5973e1accc25dc0fa
Reviewed-on: https://chromium-review.googlesource.com/685674Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Edward Jung <edwardjung@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505337}