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 380 matching lines @@
     }
 
     copyStrip();
   }
 
   return function () {
     if (image) image.onload = function(){};
     if (timeout) clearTimeout(timeout);
   };
 };
+
+ImageUtil.removeChildren = function(element) {
+  while (element.firstChild) {
+    element.removeChild(element.firstChild);
+  }
+};