chromeos: remove debugd GetModemStatus binding

Support for Gobi modems is deprecated along with daisy. The debugd
GetModemStatus API only works with cromo, which manages only Gobi
modems. The mm-status field provided by the debugd LogTool already
include status information from ModemManager.

This CL removes the modem-status entry under chrome://system and the
corresponding debugd GetModemStatus D-Bus binding.

Bug: 954634
Test: Verify that chrome://system no longer fetches modem-status from debugd.
Change-Id: Id49dc22dfa1c938fc0a5d674a6e9958c52af9297
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580104
Auto-Submit: Ben Chan <benchan@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653431}
5 files changed