fixes detection of SDK libraries

lib/runtime/dart/_js_helper.js

 dart.library('dart/_js_helper', null, /* Imports */[
   'dart/core',
   'dart/collection',
+  'dart/_interceptors',
   'dart/_foreign_helper'
 ], /* Lazy imports */[
-  'dart/_interceptors'
-], function(exports, core, collection, _foreign_helper, _interceptors) {
+], function(exports, core, collection, _interceptors, _foreign_helper) {
   'use strict';
   class NoThrows extends core.Object {
     NoThrows() {
     }
   }
   dart.setSignature(NoThrows, {
     constructors: () => ({NoThrows: [NoThrows, []]})
   });
   class NoInline extends core.Object {
     NoInline() {
@@ skipping 1046 matching lines @@
     constructors: () => ({Returns: [Returns, [core.String]]})
   });
   class JSName extends core.Object {
     JSName(name) {
       this.name = name;
     }
   }
   dart.setSignature(JSName, {
     constructors: () => ({JSName: [JSName, [core.String]]})
   });
-  dart.defineLazyClass(exports, {
-    get JavaScriptIndexingBehavior() {
-      class JavaScriptIndexingBehavior extends _interceptors.JSMutableIndexable {}
-      return JavaScriptIndexingBehavior;
-    }
-  });
+  class JavaScriptIndexingBehavior extends _interceptors.JSMutableIndexable {}
   class TypeErrorImplementation extends core.Error {
     TypeErrorImplementation(value, type) {
       this.message = `type '${Primitives.objectTypeName(value)}' is not a subtype ` + `of type '${type}'`;
       super.Error();
     }
     fromMessage(message) {
       this.message = message;
       super.Error();
     }
     toString() {
@@ skipping 100 matching lines @@
   exports.getTraceFromException = getTraceFromException;
   exports.objectHashCode = objectHashCode;
   exports.fillLiteralMap = fillLiteralMap;
   exports.convertDartClosureToJS = convertDartClosureToJS;
   exports.jsHasOwnProperty = jsHasOwnProperty;
   exports.jsPropertyAccess = jsPropertyAccess;
   exports.getFallThroughError = getFallThroughError;
   exports.Creates = Creates;
   exports.Returns = Returns;
   exports.JSName = JSName;
+  exports.JavaScriptIndexingBehavior = JavaScriptIndexingBehavior;
   exports.TypeErrorImplementation = TypeErrorImplementation;
   exports.CastErrorImplementation = CastErrorImplementation;
   exports.FallThroughErrorImplementation = FallThroughErrorImplementation;
   exports.RuntimeError = RuntimeError;
   exports.random64 = random64;
   exports.jsonEncodeNative = jsonEncodeNative;
 });