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The channel information is only used for the alt value for links to the
milestone main consoles. These are intended to be the information
displayed when hovering over the links, but this does not appear to
happen and maintaining the channel information complicates the
automation of activation and deactivation of milestones.

Bug: 1165826
Change-Id: I5524db13125d92f2cd319521f74493cda9671863
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625391
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842741}