buffet: Fix return type of DeviceRegistrationInfo::GetDeviceInfo

Result can't be any Value. According doc string it's a JSON object
which is DictionaryValue.

BUG=none
TEST=compile

Change-Id: I0988d4558629974ad1fc980a5e096319620b585c
Reviewed-on: https://chromium-review.googlesource.com/259660
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
2 files changed
tree: 76d47e79423284bfc9d990c36651b935396c7e20
  1. buffet/