Practically remove boot.js, adds the initialization from the Dart side of

pkg/polymer/lib/src/build/script_compactor.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /** Transfomer that combines multiple dart script tags into a single one. */
 library polymer.src.build.script_compactor;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
@@ skipping 28 matching lines @@
   Future apply(Transform transform) {
     var id = transform.primaryInput.id;
     var logger = transform.logger;
     return readPrimaryAsHtml(transform).then((document) {
       var libraries = [];
       bool changed = false;
       var dartLoaderTag = null;
       for (var tag in document.queryAll('script')) {
         var src = tag.attributes['src'];
         if (src != null) {
-          if (src == 'packages/polymer/boot.js') {
+          if (src == 'packages/polymer/boot.js' ||
+              src == 'packages/polymer/init.dart') {
             tag.remove();
             continue;
           }
           var last = src.split('/').last;
           if (last == 'dart.js') {
             dartLoaderTag = tag;
           }
         }
         if (tag.attributes['type'] != 'application/dart') continue;
         tag.remove();
@@ skipping 18 matching lines @@
 
       var bootstrapId = id.addExtension('_bootstrap.dart');
       var filename = path.url.basename(bootstrapId.path);
 
       var bootstrapScript = parseFragment(
             '<script type="application/dart" src="$filename"></script>');
       if (dartLoaderTag == null) {
         document.body.nodes.add(bootstrapScript);
         document.body.nodes.add(parseFragment(
             '<script src="packages/browser/dart.js"></script>'));
-      } else if (dartLoaderTag.parent != document.body) {
-        document.body.nodes.add(bootstrapScript);
       } else {
-        document.body.insertBefore(bootstrapScript, dartLoaderTag);
+        dartLoaderTag.parent.insertBefore(bootstrapScript, dartLoaderTag);
       }
 
       var urls = libraries.map((id) => assetUrlFor(id, bootstrapId, logger))
           .where((url) => url != null).toList();
       var buffer = new StringBuffer()..writeln(MAIN_HEADER);
       for (int i = 0; i < urls.length; i++) {
         buffer.writeln("import '${urls[i]}' as i$i;");
       }
       buffer..write(_mainPrefix)
           ..writeAll(urls.map((url) => "      '$url',\n"))
           ..write(_mainSuffix);
 
       transform.addOutput(new Asset.fromString(bootstrapId, buffer.toString()));
       transform.addOutput(new Asset.fromString(id, document.outerHtml));
     });
   }
 }
 
 const MAIN_HEADER = """
 library app_bootstrap;
 
 import 'package:polymer/polymer.dart';
-@MirrorsUsed(symbols: 'main', override: 'app_bootstrap')
-import 'dart:mirrors' show currentMirrorSystem, MirrorsUsed;
 """;
 
 const _mainPrefix = """
 
 void main() {
   initPolymer([
 """;
 
-// TODO(sigmund): investigate alternative to get the baseUri (dartbug.com/12612)
 const _mainSuffix = """
-    ], currentMirrorSystem().isolate.rootLibrary.uri.toString());
+    ]);
 }
 """;