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This patch removes obsolete values from InfoBarIdentifier, and labels
all removed values with "(Obsolete)" in enums.xml so it's more obvious
when looking at UMA data.

Change-Id: I4f463462d52954066a5ce38726d4694ed0f2f924
Reviewed-on: https://chromium-review.googlesource.com/702177Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506949}