pkg/polymer: remove css_lib dependency

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

Index: pkg/polymer/lib/src/build/runner.dart
diff --git a/pkg/polymer/lib/src/build/runner.dart b/pkg/polymer/lib/src/build/runner.dart
index 87db2ae9fe8ee83dae3b2ac215f2fd2fb17f3237..2706f47c5bf990cb4b359c54475bef232afb7e18 100644
--- a/pkg/polymer/lib/src/build/runner.dart
+++ b/pkg/polymer/lib/src/build/runner.dart
@@ -110,9 +110,8 @@ Map<String, String> _readPackageDirsFromPub(String currentPackage) {
 // TODO(sigmund): consider computing this list by recursively parsing
 // pubspec.yaml files in the `Options.packageDirs`.
 final Set<String> _polymerPackageDependencies = [
-    'analyzer', 'args', 'barback', 'browser', 'csslib',
-    'custom_element', 'fancy_syntax', 'html5lib', 'html_import', 'js',
-    'logging', 'meta', 'mutation_observer', 'observe', 'path'
+    'analyzer', 'args', 'barback', 'browser', 'custom_element', 'html5lib',
+    'html_import', 'js', 'logging', 'mutation_observer', 'observe', 'path'
     'polymer_expressions', 'serialization', 'shadow_dom', 'source_maps',
     'stack_trace', 'template_binding', 'unittest', 'unmodifiable_collection',
     'yaml'].toSet();