Downloads: make label styling consistent with Settings.

Bug: 846210
Change-Id: I0c20f572ad294050ec78187cfbcc6f4cdd47141f
Reviewed-on: https://chromium-review.googlesource.com/1148760
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577768}
2 files changed