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This CL removes margins and ensures Actions appear before apps.

Bug: 1097623
Change-Id: I787cb122e60f569a2085060ad32044fb9e86c437
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342334Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796283}