Refactor emitter in web-ui to make dart.js the last script, also cleanup tests

lib/src/compiler.dart

Index: lib/src/compiler.dart
diff --git a/lib/src/compiler.dart b/lib/src/compiler.dart
index 65a70e7eded569fa5678579d2be2e7008d4de754..8af2585b1324520a59ca27c21c7e348016afdd98 100644
--- a/lib/src/compiler.dart
+++ b/lib/src/compiler.dart
@@ -616,11 +616,7 @@ class Compiler {
     var document = file.document;
     var hasCss = _emitAllCss();
     transformMainHtml(document, fileInfo, _pathMapper, hasCss,
-        options.rewriteUrls, _messages);
-
-    document.body.nodes.add(parseFragment(
-        '<script type="application/dart" src="$bootstrapOutName"></script>'));
-
+        options.rewriteUrls, _messages, bootstrapOutName);
     output.add(new OutputFile(_pathMapper.outputPath(file.path, '.html'),
         document.outerHtml, source: file.path));
   }