Remove _legacyUndefinedCheck from the change-list modules Change-Id: I133851f71193434fb7380dbdc781c75573f89fd5

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
index 9cf2ad6..8eb39891 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js

@@ -26,7 +26,6 @@
 
   Polymer({
     is: 'gr-change-list-item',
-    _legacyUndefinedCheck: true,
 
     properties: {
       visibleChangeTableColumns: Array,

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
index 455019f..02e9a04 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js

@@ -31,7 +31,6 @@
 
   Polymer({
     is: 'gr-change-list-view',
-    _legacyUndefinedCheck: true,
 
     /**
      * Fired when the title of the page should change.

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js
index 085ce6e..bfd80e7 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js

@@ -24,7 +24,6 @@
 
   Polymer({
     is: 'gr-change-list',
-    _legacyUndefinedCheck: true,
 
     /**
      * Fired when next page key shortcut was pressed.

diff --git a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js
index b9df583b..19e7a25 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js

@@ -19,7 +19,6 @@
 
   Polymer({
     is: 'gr-create-change-help',
-    _legacyUndefinedCheck: true,
 
     /**
      * Fired when the "Create change" button is tapped.

diff --git a/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js b/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js
index e4958c5..5abb257 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js

@@ -25,7 +25,7 @@
 
   Polymer({
     is: 'gr-create-commands-dialog',
-    _legacyUndefinedCheck: true,
+
     properties: {
       branch: String,
       _createNewCommitCommand: {

diff --git a/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js b/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js
index ed87e9e..d601cad 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js

@@ -26,7 +26,7 @@
 
   Polymer({
     is: 'gr-create-destination-dialog',
-    _legacyUndefinedCheck: true,
+
     properties: {
       _repo: String,
       _branch: String,

diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js
index 44a1140..832400b 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js

@@ -21,7 +21,6 @@
 
   Polymer({
     is: 'gr-dashboard-view',
-    _legacyUndefinedCheck: true,
 
     /**
      * Fired when the title of the page should change.

diff --git a/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js b/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js
index 14d0cb0..acc4295 100644
--- a/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js
+++ b/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js

@@ -19,7 +19,7 @@
 
   Polymer({
     is: 'gr-embed-dashboard',
-    _legacyUndefinedCheck: true,
+
     properties: {
       account: Object,
       sections: Array,

diff --git a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js
index 67fbd97..7ae4dab 100644
--- a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js
+++ b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js

@@ -19,7 +19,7 @@
 
   Polymer({
     is: 'gr-repo-header',
-    _legacyUndefinedCheck: true,
+
     properties: {
       /** @type {?String} */
       repo: {

diff --git a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js
index 93464b7..6942705 100644
--- a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js
+++ b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js

@@ -19,7 +19,7 @@
 
   Polymer({
     is: 'gr-user-header',
-    _legacyUndefinedCheck: true,
+
     properties: {
       /** @type {?String} */
       userId: {