Use parseDirectives were possible. Also mark analyzer ready to be released.

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

Index: pkg/polymer/lib/src/build/common.dart
diff --git a/pkg/polymer/lib/src/build/common.dart b/pkg/polymer/lib/src/build/common.dart
index 2d89f192066c398f12241be594005bd237186719..77e8db7272199ed918a6b35dfce60ad6867b5bd6 100644
--- a/pkg/polymer/lib/src/build/common.dart
+++ b/pkg/polymer/lib/src/build/common.dart
@@ -172,22 +172,6 @@ String _systemToAssetPath(String assetPath) {
   return path.posix.joinAll(path.split(assetPath));
 }
 
-
-/// Parse [code] using analyzer.
-CompilationUnit parseCompilationUnit(String code) {
-  var errorListener = new _ErrorCollector();
-  var reader = new CharSequenceReader(code);
-  var scanner = new Scanner(null, reader, errorListener);
-  var token = scanner.tokenize();
-  var parser = new Parser(null, errorListener);
-  return parser.parseCompilationUnit(token);
-}
-
-class _ErrorCollector extends AnalysisErrorListener {
-  final errors = <AnalysisError>[];
-  onError(error) => errors.add(error);
-}
-
 /// These names have meaning in SVG or MathML, so they aren't allowed as custom
 /// tags. See [isCustomTagName].
 const invalidTagNames = const {