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... as well as kFrameRestoreLookKey.

Dependency/include graph:

- frame_util.cc uses kWindowManagerManagesOpacityKey
  and kFrameRestoreLookKey;

- 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: If1ba34dca49f752ec3c9247e366879c10455a5c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521691Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#824848}