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This changes:
* Removes the hairline around the menu
* Widens the menu view so that the gear and the cog are aligned with the
  edges of card content

New Screenshots:
Feed V2 Enabled: https://screenshot.googleplex.com/7X8V4WTYgTx9EUW
Feed V2 Turned Off: https://screenshot.googleplex.com/9UJLL9uDcjNGjyQ

Bug: 1123996
Change-Id: I8db77160cbae5e0121dfc3397d732b81532ff56a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388261
Commit-Queue: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Vincent Boisselle <vincb@google.com>
Reviewed-by: Cathy Li <chili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804311}