MD User manager: Migrate from PaperDialogBehavior to cr-dialog.

chrome/browser/resources/md_user_manager/import_supervised_user.js

Index: chrome/browser/resources/md_user_manager/import_supervised_user.js
diff --git a/chrome/browser/resources/md_user_manager/import_supervised_user.js b/chrome/browser/resources/md_user_manager/import_supervised_user.js
index 27491fa55a80f5dcb3e282b5f684d6498e9e2317..7ffa15638e27d99d20c57c4dde0afd028afa3c4c 100644
--- a/chrome/browser/resources/md_user_manager/import_supervised_user.js
+++ b/chrome/browser/resources/md_user_manager/import_supervised_user.js
@@ -50,11 +50,6 @@ Polymer({
     supervisedUserIndex_: {type: Number, value: NO_USER_SELECTED}
   },
 
-  /** override */
-  ready: function() {
-    this.$.dialog.lastFocusableNode = this.$.cancel;
-  },
-
   /**
    * Displays the dialog.
    * @param {(!SignedInUser|undefined)} signedInUser
@@ -72,20 +67,16 @@ Polymer({
 
     this.signedInUser_ = signedInUser || null;
     if (this.signedInUser_)
-      this.$.dialog.open();
+      this.$.dialog.showModal();
   },
 
   /**
-   * param {number} supervisedUserIndex Index of the selected supervised user.
-   * @private
+   * @param {number} supervisedUserIndex Index of the selected supervised user.
    * @return {boolean} Whether the 'Import' button should be disabled.
+   * @private
    */
   isImportDisabled_: function(supervisedUserIndex) {
-    var disabled = supervisedUserIndex == NO_USER_SELECTED;
-    if (!disabled) {
-      this.$.dialog.lastFocusableNode = this.$.import;
-    }
-    return disabled;
+    return supervisedUserIndex == NO_USER_SELECTED;
   },
 
   /**
@@ -102,6 +93,11 @@ Polymer({
           'import',
           {supervisedUser: supervisedUser, signedInUser: this.signedInUser_});
     }
-  }
+  },
+
+  /** @private */
+  onCancelTap_: function() {
+    this.$.dialog.close();
+  },
 });
 })();