SDK fixes

lib/runtime/dart/isolate.js

 var isolate;
 (function(exports) {
   'use strict';
   class Capability extends core.Object {
     Capability() {
       return new _isolate_helper.CapabilityImpl();
     }
   }
   class IsolateSpawnException extends core.Object {
     IsolateSpawnException(message) {
@@ skipping 25 matching lines @@
         return new async.Future$(Isolate).error(e, st);
       }
 
     }
     static spawnUri(uri, args, message, opts) {
       let paused = opts && 'paused' in opts ? opts.paused : false;
       let packageRoot = opts && 'packageRoot' in opts ? opts.packageRoot : null;
       if (packageRoot != null)
         throw new core.UnimplementedError("packageRoot");
       try {
-        if (dart.is(args, core.List$(core.String))) {
+        if (dart.is(args, core.List)) {
           for (let i = 0; dart.notNull(i) < dart.notNull(args[core.$length]); i = dart.notNull(i) + 1) {
             if (!(typeof args[core.$get](i) == 'string')) {
               throw new core.ArgumentError(`Args must be a list of Strings ${args}`);
             }
           }
         } else if (args != null) {
           throw new core.ArgumentError(`Args must be a list of Strings ${args}`);
         }
         return dart.as(_isolate_helper.IsolateNatives.spawnUri(uri, args, message, paused).then(msg => new Isolate(dart.as(dart.dindex(msg, 1), SendPort), {pauseCapability: dart.as(dart.dindex(msg, 2), Capability), terminateCapability: dart.as(dart.dindex(msg, 3), Capability)})), async.Future$(Isolate));
       } catch (e) {
@@ skipping 154 matching lines @@
   _RemoteStackTrace[dart.implements] = () => [core.StackTrace];
   // Exports:
   exports.Capability = Capability;
   exports.IsolateSpawnException = IsolateSpawnException;
   exports.Isolate = Isolate;
   exports.SendPort = SendPort;
   exports.ReceivePort = ReceivePort;
   exports.RawReceivePort = RawReceivePort;
   exports.RemoteError = RemoteError;
 })(isolate || (isolate = {}));