batteryservice: remove now unused struct BatteryExtraProperties

Change-Id: Ibbb1eba95a800d2198e7524149ce38beb13dd7c9
diff --git a/include/batteryservice/BatteryService.h b/include/batteryservice/BatteryService.h
index 689a7e6..7ae1342 100644
--- a/include/batteryservice/BatteryService.h
+++ b/include/batteryservice/BatteryService.h
@@ -66,11 +66,6 @@
     status_t readFromParcel(Parcel* parcel);
 };
 
-struct BatteryExtraProperties {
-    int batteryCurrentNow;
-    int batteryChargeCounter;
-};
-
 struct BatteryProperty {
     int valueInt;