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Changed chrome://connection-help UI to automatically expand a section
if it matches the interstitial that caused the redirection.
Also removed windows only section on non-windows platforms.

Change-Id: I1287a4bdbc95d9cd5052212194450e72a3ebb18e
Reviewed-on: https://chromium-review.googlesource.com/988838
Commit-Queue: Carlos IL <carlosil@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548248}