The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform2/+/3126664e62c29c8fe382c83a0dab27df519d8b0d

commit 3126664e62c29c8fe382c83a0dab27df519d8b0d
Author: Simon Glass <sjg@chromium.org>
Date: Wed Sep 06 19:42:47 2017

chromeos-config: powermanager: Rename powerd_prefs propery

The convention is to use hyphen rather than underscore for property names.
Rename this property to comply with that convention.

BUG= chromium:761267 
TEST=none

Change-Id: I1355f429b4b89a4c043d548ac4c8a7e7cda81cbc
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/646996
Reviewed-by: Benjamin Gordon <bmgordon@chromium.org>
Reviewed-by: C Shapiro <shapiroc@google.com>

[modify] https://crrev.com/3126664e62c29c8fe382c83a0dab27df519d8b0d/chromeos-config/README.md
[modify] https://crrev.com/3126664e62c29c8fe382c83a0dab27df519d8b0d/power_manager/common/prefs.cc