libchromeos: Replace ScopedDBusErrorWrapper with dbus::ScopedDBusError

dbus::ScopedDBusError has been fixed on Chrome side to remove inlined
calls to dbus-1 library functions and now ScopedDBusErrorWrapper is
not needed anymore.

BUG=chromium:416628
TEST=FEATURES=test emerge-link libchromeos apmanager peerd privetd lorgnette buffet

Change-Id: I372efcddd837f66cf66c1d1d4278adb034b79a14
Reviewed-on: https://chromium-review.googlesource.com/235814
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
3 files changed