PDF: Replace usage of i18nTemplate with Polymer data binding

chrome/browser/resources/pdf/elements/viewer-password-screen/viewer-password-screen.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 Polymer({
   is: 'viewer-password-screen',
 
   properties: {
     invalid: Boolean,
 
     active: {
       type: Boolean,
       value: false,
       observer: 'activeChanged'
-    }
+    },
+
+    strings: Object,
   },
 
   ready: function() {
     this.activeChanged();
   },
 
   accept: function() {
     this.active = false;
   },
 
@@ skipping 20 matching lines @@
 
   activeChanged: function() {
     if (this.active) {
       this.$.dialog.open();
       this.$.password.focus();
     } else {
       this.$.dialog.close();
     }
   }
 });