Eliminate use of assignments to innerHTML in File Browser

chrome/browser/resources/file_manager/js/image_editor/image_util.js

 // Copyright (c) 2011 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.
 
 
 // Namespace object for the utilities.
 function ImageUtil() {}
 
 // Performance trace.
 ImageUtil.trace = (function() {
@@ skipping 416 matching lines @@
     callback(context.canvas);
   } else {
     var self = this;
     this.timeout_ = setTimeout(
         function() {
           self.timeout_ = null;
           self.copyStrip_(context, lastRow, rowCount);
         }, 0);
   }
 };
+
+ImageUtil.removeChildren = function(element) {
+  element.textContent = '';
+};