Fix expected PlacementList sort order.

ui/display/manager/display_layout_store.cc

Index: ui/display/manager/display_layout_store.cc
diff --git a/ui/display/manager/display_layout_store.cc b/ui/display/manager/display_layout_store.cc
index f064251944c5143311a9d33721b2272248061d40..7e94b343fee0a9e19f1ab5ab7ca9ec098f62cb45 100644
--- a/ui/display/manager/display_layout_store.cc
+++ b/ui/display/manager/display_layout_store.cc
@@ -72,9 +72,17 @@ void DisplayLayoutStore::RegisterLayoutForDisplayIdList(
       layout->placement_list[0].parent_display_id = list[0];
     }
   }
-  DCHECK(DisplayLayout::Validate(list, *layout.get()))
-      << "ids=" << DisplayIdListToString(list)
-      << ", layout=" << layout->ToString();
+
+  if (!DisplayLayout::Validate(list, *layout.get())) {
+    NOTREACHED() << "Attempting to register an invalid layout: ids="
+                 << DisplayIdListToString(list)
+                 << ", layout=" << layout->ToString();
+    // We never allow to register an invalid layout, instead, we revert back to
+    // a default layout.
+    CreateDefaultDisplayLayout(list);
+    return;
+  }
+
   layouts_[list] = std::move(layout);
 }