Get the rest of the shared tests for covariant to pass

pkg/analyzer/lib/src/dart/error/syntactic_errors.dart

Index: pkg/analyzer/lib/src/dart/error/syntactic_errors.dart
diff --git a/pkg/analyzer/lib/src/dart/error/syntactic_errors.dart b/pkg/analyzer/lib/src/dart/error/syntactic_errors.dart
index 798e30dac4623aef3b37155769a7e8d5ad444c35..70f1124b06a0a49d3849753031dccdcc9035adf5 100644
--- a/pkg/analyzer/lib/src/dart/error/syntactic_errors.dart
+++ b/pkg/analyzer/lib/src/dart/error/syntactic_errors.dart
@@ -157,6 +157,11 @@ class ParserErrorCode extends ErrorCode {
       "Members can't be declared to be both 'covariant' and 'static'.",
       "Try removing either the 'covariant' or 'static' keyword.");
 
+  static const ParserErrorCode COVARIANT_MEMBER = const ParserErrorCode(
+      'COVARIANT_MEMBER',
+      "Getters, setters and methods can't be declared to be 'covariant'.",
+      "Try removing the 'covariant' keyword.");
+
   static const ParserErrorCode COVARIANT_TOP_LEVEL_DECLARATION =
       const ParserErrorCode(
           'COVARIANT_TOP_LEVEL_DECLARATION',