Do not register invalid layout

ash/display/display_layout.cc

Index: ash/display/display_layout.cc
diff --git a/ash/display/display_layout.cc b/ash/display/display_layout.cc
index f5aa8f4066ea303ad63c124b57fce10b825ffd85..a3bd093b57ed2d5bcc4fc77b35b22e999734de6e 100644
--- a/ash/display/display_layout.cc
+++ b/ash/display/display_layout.cc
@@ -228,7 +228,8 @@ void DisplayLayout::RegisterJSONConverter(
 bool DisplayLayout::Validate(const DisplayIdList& list,
                              const DisplayLayout& layout) {
   // The primary display should be in the list.
-  DCHECK(IsIdInList(layout.primary_id, list));
+  if (!IsIdInList(layout.primary_id, list))
+    return false;
 
   // Unified mode, or mirror mode switched from unified mode,
   // may not have the placement yet.