webui fixes for 0.8.9

lib/component_build.dart

Index: lib/component_build.dart
diff --git a/lib/component_build.dart b/lib/component_build.dart
index b975328dca5934342c941e52f52f64f1901ee207..637e2ebef7d74620d9d55bea42eb330bfa1eeb5a 100644
--- a/lib/component_build.dart
+++ b/lib/component_build.dart
@@ -111,7 +111,7 @@ Future<List<dwc.CompilerResult>> build(List<String> arguments,
 String _outDir(String file) => path.join(path.dirname(file), 'out');
 
 /** Tell whether [filePath] is a generated file. */
-bool _isGeneratedFile(String filePath, List<Directory> outputOnlyDirs) {
+bool _isGeneratedFile(String filePath, List<String> outputOnlyDirs) {
   var dirPrefix = path.dirname(filePath);
   for (var outDir in outputOnlyDirs) {
     if (dirPrefix.startsWith(outDir)) return true;