Print Preview: Fix compile errors in settings/ directory

chrome/browser/resources/print_preview/settings/page_settings.js

 // Copyright (c) 2012 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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Creates a PageSettings object. This object encapsulates all settings and
    * logic related to page selection.
@@ skipping 39 matching lines @@
      * @private
      */
     this.allRadio_ = null;
 
     /**
      * Container of a hint to show when the custom page range is invalid.
      * @type {HTMLElement}
      * @private
      */
     this.customHintEl_ = null;
-  };
+  }
 
   /**
    * CSS classes used by the page settings.
    * @enum {string}
    * @private
    */
   PageSettings.Classes_ = {
     ALL_RADIO: 'page-settings-all-radio',
     CUSTOM_HINT: 'page-settings-custom-hint',
     CUSTOM_INPUT: 'page-settings-custom-input',
@@ skipping 23 matching lines @@
     /** @override */
     set isEnabled(isEnabled) {
       this.customInput_.disabled = !isEnabled;
       this.allRadio_.disabled = !isEnabled;
       this.customRadio_.disabled = !isEnabled;
     },
 
     /** @override */
     enterDocument: function() {
       print_preview.SettingsSection.prototype.enterDocument.call(this);
+      var customInput = assert(this.customInput_);
       this.tracker.add(
-          this.allRadio_, 'click', this.onAllRadioClick_.bind(this));
+          assert(this.allRadio_), 'click', this.onAllRadioClick_.bind(this));
       this.tracker.add(
-          this.customRadio_, 'click', this.onCustomRadioClick_.bind(this));
+          assert(this.customRadio_),
+          'click',
+          this.onCustomRadioClick_.bind(this));
       this.tracker.add(
-          this.customInput_, 'blur', this.onCustomInputBlur_.bind(this));
+          customInput,
+          'blur',
+          this.onCustomInputBlur_.bind(this));
       this.tracker.add(
-          this.customInput_, 'focus', this.onCustomInputFocus_.bind(this));
+          customInput,
+          'focus',
+          this.onCustomInputFocus_.bind(this));
       this.tracker.add(
-          this.customInput_, 'keydown', this.onCustomInputKeyDown_.bind(this));
+          customInput,
+          'keydown',
+          this.onCustomInputKeyDown_.bind(this));
       this.tracker.add(
-          this.customInput_, 'input', this.onCustomInputChange_.bind(this));
+          customInput,
+          'input',
+          this.onCustomInputChange_.bind(this));
       this.tracker.add(
           this.pageRangeTicketItem_,
           print_preview.ticket_items.TicketItem.EventType.CHANGE,
           this.onPageRangeTicketItemChange_.bind(this));
     },
 
     /** @override */
     exitDocument: function() {
       print_preview.SettingsSection.prototype.exitDocument.call(this);
       this.customInput_ = null;
@@ skipping 143 matching lines @@
       }
       this.updateUiStateInternal();
     }
   };
 
   // Export
   return {
     PageSettings: PageSettings
   };
 });