Replace UMA current reporting with simpler charger type stat.

We no longer need the current/voltage stats.  Instead we're interested
in seeing what chargers are actually used.

BUG=chrome-os-partner:23973
TEST=manual

Original-Change-Id: I3a2cd1175cdbf135e6073ca46cbf5dd89a3d798e
Reviewed-on: https://chromium-review.googlesource.com/177294
Tested-by: Luigi Semenzato <semenzato@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
(cherry picked from commit e13d4d0834cc3b5bc804fe2797fa39a59c616452)

Change-Id: Ie72f1d66765daa6df3096ba97c7c4b4dd9ec714c
Reviewed-on: https://chromium-review.googlesource.com/177602
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
2 files changed