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

chrome/browser/resources/md_user_manager/error_dialog.html

Index: chrome/browser/resources/md_user_manager/error_dialog.html
diff --git a/chrome/browser/resources/md_user_manager/error_dialog.html b/chrome/browser/resources/md_user_manager/error_dialog.html
index 6c403d34c7c40f42d81cade4dd7af22f81ae41fc..f7964ca38e75351d6a688e3e1f83f1b2c9877bf9 100644
--- a/chrome/browser/resources/md_user_manager/error_dialog.html
+++ b/chrome/browser/resources/md_user_manager/error_dialog.html
@@ -1,14 +1,12 @@
 <link rel="import" href="/shared_styles.html">
-<link rel="import" href="/user_manager_dialog.html">
+<link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <dom-module id="error-dialog">
   <template>
     <style include="shared-styles">
-      #dialog {
-        --user-manager-dialog-title-bar: {
-          border-bottom: 0;
-        };
+      :host {
+        color: var(--primary-text-color);
       }
 
       #message {
@@ -17,11 +15,11 @@
         word-wrap: break-word;
       }
     </style>
-    <user-manager-dialog id="dialog">
+    <dialog is="cr-dialog" id="dialog">
       <div class="body">
         <div id="message">[[message_]]</div>
       </div>
-    </user-manager-dialog>
+    </dialog>
   </template>
   <script src="error_dialog.js"></script>
 </dom-module>