GitLab

Insets were a little off spec in that:
- Label was 4dip too close to right edge
- Pin toggle was 2dip too close to right edge

This CL also reduces scope of some item chip related constants.

Bug: 1164608
Change-Id: If5050bcd3636f3cb2d7da6347c80d09f5a4a7238
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619083Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#841798}