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Also adds an option to sort by hostname on the DataSaver settings page
so that the TalkBack navigation experience is consistent with the other
table headers.

Bug: 836018
Change-Id: Ic837d520ea613185398b0b2214640b80a41bcfa4
Reviewed-on: https://chromium-review.googlesource.com/1077588Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563052}