fixes #157, renaming local library identifiers if needed.

lib/runtime/dart/convert.js

Index: lib/runtime/dart/convert.js
diff --git a/lib/runtime/dart/convert.js b/lib/runtime/dart/convert.js
index a5ba6200032f7e8cf2e813e3793a48416f07a74a..fef48e2fb0a20364cfa08d4a50630fd56592ee46 100644
--- a/lib/runtime/dart/convert.js
+++ b/lib/runtime/dart/convert.js
@@ -1,5 +1,10 @@
-var convert;
-(function(exports) {
+var convert = dart.defineLibrary(convert, {});
+var core = dart.lazyImport(core);
+var async = dart.import(async);
+var typed_data = dart.import(typed_data);
+var _internal = dart.lazyImport(_internal);
+var collection = dart.lazyImport(collection);
+(function(exports, core, async, typed_data, _internal, collection) {
   'use strict';
   let ASCII = dart.const(new AsciiCodec());
   let _ASCII_MASK = 127;
@@ -91,7 +96,7 @@ var convert;
       }
       bind(source) {
         dart.as(source, async.Stream$(S));
-        return new async.Stream$(T).eventTransformed(source, (sink => new _ConverterStreamEventSink(this, sink)).bind(this));
+        return new (async.Stream$(T)).eventTransformed(source, (sink => new _ConverterStreamEventSink(this, sink)).bind(this));
       }
     }
     Converter[dart.implements] = () => [async.StreamTransformer$(S, T)];
@@ -2429,4 +2434,4 @@ var convert;
   exports.Utf8Codec = Utf8Codec;
   exports.Utf8Encoder = Utf8Encoder;
   exports.Utf8Decoder = Utf8Decoder;
-})(convert || (convert = {}));
+})(convert, core, async, typed_data, _internal, collection);