Delete BaseStatusBar

It is a relic of a more complex time, but has passed out of all
knowledge for too long.

Test: manual testing on phones and TV
Change-Id: I62a15d9413ea4bda3ac82bf6f7d22c096e2c1cdc
diff --git a/packages/SystemUI/proguard.flags b/packages/SystemUI/proguard.flags
index 364885a..6d76798 100644
--- a/packages/SystemUI/proguard.flags
+++ b/packages/SystemUI/proguard.flags
@@ -11,7 +11,7 @@
 }
 
 -keep class com.android.systemui.statusbar.car.CarStatusBar
--keep class com.android.systemui.statusbar.phone.PhoneStatusBar
+-keep class com.android.systemui.statusbar.phone.StatusBar
 -keep class com.android.systemui.statusbar.tv.TvStatusBar
 -keep class com.android.systemui.car.CarSystemUIFactory
 -keep class com.android.systemui.SystemUIFactory