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Spacing between buttons on the downloads page was not specified in the
styling, and was instead the result of whitespace that is removed when
using the legacyOptimizations: true flag in Polymer 2. Specify 8px
margin between buttons to match spacing used in other Web UI
paper-buttons.

Bug: 912488
Change-Id: Icca140d02fe85fbb8b847b67f6925da87e13b26f
Reviewed-on: https://chromium-review.googlesource.com/c/1373137Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616015}