a few small refactorings to closure workarounds

lib/runtime/dart/html_common.js

 dart_library.library('dart/html_common', null, /* Imports */[
   'dart/_runtime',
   'dart/_metadata',
   'dart/core',
   'dart/html',
   'dart/typed_data',
   'dart/_js_helper',
   'dart/_native_typed_data',
   'dart/async',
-  'dart/collection',
-  'dart/_internal'
+  'dart/_internal',
+  'dart/collection'
 ], /* Lazy imports */[
   'dart/web_gl'
-], function(exports, dart, _metadata, core, html, typed_data, _js_helper, _native_typed_data, async, collection, _internal, web_gl) {
+], function(exports, dart, _metadata, core, html, typed_data, _js_helper, _native_typed_data, async, _internal, collection, web_gl) {
   'use strict';
   let dartx = dart.dartx;
   dart.export(exports, _metadata);
   const _validateToken = Symbol('_validateToken');
   class CssClassSetImpl extends core.Object {
     [_validateToken](value) {
       if (dart.notNull(CssClassSetImpl._validTokenRE.hasMatch(value))) return value;
       dart.throw(new core.ArgumentError.value(value, 'value', 'Not a valid class token'));
     }
     toString() {
@@ skipping 926 matching lines @@
   exports.isImmutableJavaScriptArray = isImmutableJavaScriptArray;
   exports.isJavaScriptPromise = isJavaScriptPromise;
   exports.convertNativePromiseToDartFuture = convertNativePromiseToDartFuture;
   exports.wrap_jso = wrap_jso;
   exports.unwrap_jso = unwrap_jso;
   exports.Device = Device;
   exports.FilteredElementList = FilteredElementList;
   exports.Lists = Lists;
   exports.NodeListWrapper = NodeListWrapper;
 });