Move frame_utils.cc to //chromeos/ui/frame

Dependency/include graph:

- frame_utils.h is included by frame_header.cc;
- frame_header.h is included by default_frame_header.h
- browser_non_client_frame_view_ash.cc includes default_frame_header.h.

So, in order to free browser_non_client_frame_view_ash.cc|h from
including //ash/ headers the items above will migrate step by step
to //chromeos/ui.

BUG=1113900
R=jamescook@chromium.org, sky@chromium.org

Change-Id: I573a053321b82825d80554c1a3c44079bf6d2a4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521364


Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824893}