Fix shelf alignment and auto-hide initialization.

ash/common/shelf/wm_shelf.h

Index: ash/common/shelf/wm_shelf.h
diff --git a/ash/common/shelf/wm_shelf.h b/ash/common/shelf/wm_shelf.h
index 5e9aed6a7b8fef86aa711a3fff249205a98a408b..b2e858a7976c7a7be42cc8a369fb03be4730c439 100644
--- a/ash/common/shelf/wm_shelf.h
+++ b/ash/common/shelf/wm_shelf.h
@@ -163,13 +163,13 @@ class ASH_EXPORT WmShelf : public ShelfLayoutManagerObserver {
   // hierarchy. Null before login and in secondary display init.
   ShelfView* shelf_view_ = nullptr;
 
+  // These initial values hide the shelf until user preferences are available.
   ShelfAlignment alignment_ = SHELF_ALIGNMENT_BOTTOM_LOCKED;
+  ShelfAutoHideBehavior auto_hide_behavior_ = SHELF_AUTO_HIDE_ALWAYS_HIDDEN;
 
   // Sets shelf alignment to bottom during login and screen lock.
   std::unique_ptr<ShelfLockingManager> shelf_locking_manager_;
 
-  ShelfAutoHideBehavior auto_hide_behavior_ = SHELF_AUTO_HIDE_BEHAVIOR_NEVER;
-
   base::ObserverList<WmShelfObserver> observers_;
 
   // Forwards mouse and gesture events to ShelfLayoutManager for auto-hide.