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This CL fixes a regression that leads to inconsistent widths for the
items on the download shelf. This regression was introduced by
https://chromium-review.googlesource.com/c/chromium/src/+/1864876

Fixed: 1017101, 1017921
Change-Id: Id0365810848dcdac59edec49eae1197c02130d00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887890Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711056}