Docs: removing import ServiceManager (unnecessary)

Bug: 25834324
Change-Id: I07ffb5372f6acbfade08902ce31dcee9847dd731
diff --git a/src/devices/tech/power/device.jd b/src/devices/tech/power/device.jd
index 985b9c0..b3d6e30 100644
--- a/src/devices/tech/power/device.jd
+++ b/src/devices/tech/power/device.jd
@@ -47,7 +47,6 @@
 
 <pre>
 import android.os.BatteryManager;
-import android.os.ServiceManager;
 import android.content.Context;
 BatteryManager mBatteryManager =
 (BatteryManager)Context.getSystemService(Context.BATTERY_SERVICE);