Test whether DDC sdk is up-to-date

pkg/dev_compiler/lib/js/amd/dart_sdk.js

Index: pkg/dev_compiler/lib/js/amd/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/amd/dart_sdk.js b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
index 1855f5788f716f451e472b2f492492499fdbf40c..beda86ab2575860a468c0d5d51fe758769c8dadb 100644
--- a/pkg/dev_compiler/lib/js/amd/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
@@ -116484,22 +116484,6 @@ define([], function() {
     methods: () => ({[$executeSql]: dart.fnType(dart.void, [core.String], [core.List, web_sql.SqlStatementCallback, web_sql.SqlStatementErrorCallback])})
   });
   dart.registerExtension("SQLTransaction", web_sql.SqlTransaction);
-  nativewrappers.NativeFieldWrapperClass1 = class NativeFieldWrapperClass1 extends core.Object {};
-  (nativewrappers.NativeFieldWrapperClass1.new = function() {
-  }).prototype = nativewrappers.NativeFieldWrapperClass1.prototype;
-  dart.addTypeTests(nativewrappers.NativeFieldWrapperClass1);
-  nativewrappers.NativeFieldWrapperClass2 = class NativeFieldWrapperClass2 extends core.Object {};
-  (nativewrappers.NativeFieldWrapperClass2.new = function() {
-  }).prototype = nativewrappers.NativeFieldWrapperClass2.prototype;
-  dart.addTypeTests(nativewrappers.NativeFieldWrapperClass2);
-  nativewrappers.NativeFieldWrapperClass3 = class NativeFieldWrapperClass3 extends core.Object {};
-  (nativewrappers.NativeFieldWrapperClass3.new = function() {
-  }).prototype = nativewrappers.NativeFieldWrapperClass3.prototype;
-  dart.addTypeTests(nativewrappers.NativeFieldWrapperClass3);
-  nativewrappers.NativeFieldWrapperClass4 = class NativeFieldWrapperClass4 extends core.Object {};
-  (nativewrappers.NativeFieldWrapperClass4.new = function() {
-  }).prototype = nativewrappers.NativeFieldWrapperClass4.prototype;
-  dart.addTypeTests(nativewrappers.NativeFieldWrapperClass4);
   dart.trackLibraries("dart_sdk", {
     "dart:_runtime": dart,
     "dart:_debugger": _debugger,