Move decoration intelligence of profile menus into base class.

Formatting and decoration intelligence of ProfileChooserView and
IncognitoMenuView are moved to ProfileMenuViewBase.
This removes the different individual constants used in the child
classes and makes all menus more in harmony.

Screenshots of visual changes:
https://screenshot.googleplex.com/bTuWe5nYrXx

Bug: 934689
Change-Id: I0186cb0147bead43aa2b597ae41ab41253f8d43c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1563991
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653920}
7 files changed