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- Set feature enabled values in the toolbar directly, when strings are
set, rather than doing this from the viewer.
- Simplify/clean up styles in the dropdown to match them to the menu
being added
- Cleanups in viewer-pdf-toolbar.html

Bug: 1078543
Change-Id: I4146ff642d2ea482f343149a52c00253844ed3b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2223153
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773472}