Fix hints reported by analyzer.

pkg/compiler/lib/src/serialization/serialization_util.dart

Index: pkg/compiler/lib/src/serialization/serialization_util.dart
diff --git a/pkg/compiler/lib/src/serialization/serialization_util.dart b/pkg/compiler/lib/src/serialization/serialization_util.dart
index 9c7d1a818a17072241ef8b661ce05bdd8f6d2c71..8816cbdd5e24167abdefb4592ee6af193d56fca3 100644
--- a/pkg/compiler/lib/src/serialization/serialization_util.dart
+++ b/pkg/compiler/lib/src/serialization/serialization_util.dart
@@ -52,9 +52,6 @@ Selector deserializeSelector(ObjectDecoder decoder) {
   int argumentCount = decoder.getInt(Key.ARGUMENTS);
   List<String> namedArguments =
       decoder.getStrings(Key.NAMED_ARGUMENTS, isOptional: true);
-  String name = decoder.getString(Key.NAME);
-  bool isSetter = decoder.getBool(Key.IS_SETTER);
-  LibraryElement library = decoder.getElement(Key.LIBRARY, isOptional: true);
   return new Selector(kind, deserializeName(decoder),
       new CallStructure(argumentCount, namedArguments));
 }