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Expand share target list width to 200px. Simplify the margins/padding by
removing some of the unnecessary interstital margins on the preview and
list elements and instead putting padding on the main content div.
Change the top margin on the #process-row to 24px to match spec.

Screenshot: https://screenshot.googleplex.com/6Vs8tWVZypxn3Lk.png

Fixed: 1145023
Change-Id: If1cecd192623e5edb638e44190949bf194625108
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593922
Commit-Queue: Curt Clemens <cclem@google.com>
Reviewed-by: James Vecore <vecore@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837397}