Add  _legacyUndefinedCheck

Change-Id: I35161291e3927bb55d8af5ccd5fe1000a26686bc
diff --git a/gr-checks/gr-checks-change-list-header-view.js b/gr-checks/gr-checks-change-list-header-view.js
index 7a6a773..ee3b994 100644
--- a/gr-checks/gr-checks-change-list-header-view.js
+++ b/gr-checks/gr-checks-change-list-header-view.js
@@ -1,7 +1,7 @@
 (function() {
 'use strict';
 
-Polymer({
-  is: 'gr-checks-change-list-header-view',
-});
+  Polymer({
+    is: 'gr-checks-change-list-header-view',
+  });
 })();
diff --git a/gr-checks/gr-checks-change-list-item-cell-view.js b/gr-checks/gr-checks-change-list-item-cell-view.js
index 4d45a44..65be586 100644
--- a/gr-checks/gr-checks-change-list-item-cell-view.js
+++ b/gr-checks/gr-checks-change-list-item-cell-view.js
@@ -1,11 +1,11 @@
 (function() {
 'use strict';
 
-Polymer({
-  is: 'gr-checks-change-list-item-cell-view',
+  Polymer({
+    is: 'gr-checks-change-list-item-cell-view',
 
-  properties: {
-    change: Object,
-  },
-});
+    properties: {
+      change: Object,
+    },
+  });
 })();
diff --git a/gr-checks/gr-checks-change-view-tab-header-view.js b/gr-checks/gr-checks-change-view-tab-header-view.js
index b18ce2f..e77a888 100644
--- a/gr-checks/gr-checks-change-view-tab-header-view.js
+++ b/gr-checks/gr-checks-change-view-tab-header-view.js
@@ -1,7 +1,7 @@
 (function() {
 'use strict';
 
-Polymer({
-  is: 'gr-checks-change-view-tab-header-view',
-});
+  Polymer({
+    is: 'gr-checks-change-view-tab-header-view',
+  });
 })();
diff --git a/gr-checks/gr-checks-chip-view.js b/gr-checks/gr-checks-chip-view.js
index 778f87d..70ce5d0 100644
--- a/gr-checks/gr-checks-chip-view.js
+++ b/gr-checks/gr-checks-chip-view.js
@@ -47,6 +47,7 @@
 
   Polymer({
     is: 'gr-checks-chip-view',
+    _legacyUndefinedCheck: true,
 
     properties: {
       revision: Object,
diff --git a/gr-checks/gr-checks-item.js b/gr-checks/gr-checks-item.js
index 7777f75..8a1a54c 100644
--- a/gr-checks/gr-checks-item.js
+++ b/gr-checks/gr-checks-item.js
@@ -23,6 +23,7 @@
 
   Polymer({
     is: 'gr-checks-item',
+    _legacyUndefinedCheck: true,
 
     properties: {
       /** @type {Defs.Check} */
diff --git a/gr-checks/gr-checks-status.js b/gr-checks/gr-checks-status.js
index e187b20..721c3cf 100644
--- a/gr-checks/gr-checks-status.js
+++ b/gr-checks/gr-checks-status.js
@@ -1,37 +1,38 @@
 (function() {
 'use strict';
 
-Polymer({
-  is: 'gr-checks-status',
+  Polymer({
+    is: 'gr-checks-status',
+    _legacyUndefinedCheck: true,
 
-  properties: {
-    showText: {
-      type: Boolean,
-      value: false,
-      reflectToAttribute: true,
+    properties: {
+      showText: {
+        type: Boolean,
+        value: false,
+        reflectToAttribute: true,
+      },
+      status: String,
+      _className: {type: String, computed: '_computeClassName(status)'},
     },
-    status: String,
-    _className: {type: String, computed: '_computeClassName(status)'},
-  },
 
-  _isUnevaluated(status) {
-    return window.Gerrit.Checks.isUnevaluated(status);
-  },
+    _isUnevaluated(status) {
+      return window.Gerrit.Checks.isUnevaluated(status);
+    },
 
-  _isInProgress(status) {
-    return window.Gerrit.Checks.isInProgress(status);
-  },
+    _isInProgress(status) {
+      return window.Gerrit.Checks.isInProgress(status);
+    },
 
-  _isSuccessful(status) {
-    return window.Gerrit.Checks.isSuccessful(status);
-  },
+    _isSuccessful(status) {
+      return window.Gerrit.Checks.isSuccessful(status);
+    },
 
-  _isFailed(status) {
-    return window.Gerrit.Checks.isFailed(status);
-  },
+    _isFailed(status) {
+      return window.Gerrit.Checks.isFailed(status);
+    },
 
-  _computeClassName(status) {
-    return window.Gerrit.Checks.statusClass(status);
-  },
-});
+    _computeClassName(status) {
+      return window.Gerrit.Checks.statusClass(status);
+    },
+  });
 })();
diff --git a/gr-checks/gr-checks-view.js b/gr-checks/gr-checks-view.js
index 7bee91a..6d54eb2 100644
--- a/gr-checks/gr-checks-view.js
+++ b/gr-checks/gr-checks-view.js
@@ -24,6 +24,7 @@
 
   Polymer({
     is: 'gr-checks-view',
+    _legacyUndefinedCheck: true,
 
     properties: {
       revision: Object,