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This CL does two things:
* It decreases height of feature pod hover when the pod doesn't have
  sub-label. (https://crbug.com/858942)
* It increases width of the hover when it doesn't have enough space to
  show detailed view arrow. Previously, it hid the arrow in such case.
  In order to do that, it increased the width of feature pod button by
  28px because we symmetrically increase the hover width.
  The arrow and the spacing takes 14px in total.

Screenshot(before): http://screen/5bzdLf3rGQn
Screenshot(after): http://screen/48Jr2f39Kp7

TEST=manual
BUG=858942,858913

Change-Id: If1db17c0fa932188b36b02979374253f5cde084d
Reviewed-on: https://chromium-review.googlesource.com/1124199
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572480}