Revert of mash: Fix MusPropertyMirrorAsh for owned properties; add test.

ash/common/shelf/shelf_constants.h

Index: ash/common/shelf/shelf_constants.h
diff --git a/ash/common/shelf/shelf_constants.h b/ash/common/shelf/shelf_constants.h
index dc584ebff63c998b038bdcf81fcb741825be0e35..708e2adbe3b1601d128443a1a6ef841bbfe2890b 100644
--- a/ash/common/shelf/shelf_constants.h
+++ b/ash/common/shelf/shelf_constants.h
@@ -43,6 +43,8 @@
 // the shelf items, notifications, status area etc.
 extern const int kShelfItemInset;
 
+const int kInvalidShelfID = 0;
+
 // Animation duration for switching black shelf and dock background on and off.
 ASH_EXPORT extern const int kTimeToSwitchBackgroundMs;