Compile print_preview, part 3: reduce down to 185 errors

chrome/browser/resources/print_preview/common/search_box.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Component that renders a search box for searching through destinations.
    * @param {string} searchBoxPlaceholderText Search box placeholder text.
@@ skipping 48 matching lines @@
 
     /** Sets the input element of the search box in focus. */
     focus: function() {
       this.input_.focus();
     },
 
     /** @override */
     createDom: function() {
       this.setElementInternal(this.cloneTemplateInternal(
           'search-box-template'));
-      this.input_ = this.getChildElement('.search-box-input');
+      this.input_ = assertInstanceof(this.getChildElement('.search-box-input'),
+          HTMLInputElement);
       this.input_.setAttribute('placeholder', this.searchBoxPlaceholderText_);
     },
 
     /** @override */
     enterDocument: function() {
       print_preview.Component.prototype.enterDocument.call(this);
       this.tracker.add(assert(this.input_), 'input',
                        this.onInputInput_.bind(this));
     },
 
@@ skipping 40 matching lines @@
       this.timeout_ = setTimeout(
           this.dispatchSearchEvent_.bind(this), SearchBox.SEARCH_DELAY_);
     }
   };
 
   // Export
   return {
     SearchBox: SearchBox
   };
 });