Change memberName and namedArguments in Invocation to use Symbol.

dart/tests/language/no_such_method_test.dart

Index: dart/tests/language/no_such_method_test.dart
diff --git a/dart/tests/language/no_such_method_test.dart b/dart/tests/language/no_such_method_test.dart
index 39f1417c28857255853267e2df1a6b227925a0b0..d112019e4addd15164355b7ee15c2c4d7259e03a 100644
--- a/dart/tests/language/no_such_method_test.dart
+++ b/dart/tests/language/no_such_method_test.dart
@@ -22,7 +22,7 @@ class NoSuchMethodTest {
     Expect.equals("moo", getName(im));
     Expect.equals(0, im.positionalArguments.length);
     Expect.equals(1, im.namedArguments.length);
-    return foo(b:im.namedArguments["b"]);
+    return foo(b:im.namedArguments[const Symbol("b")]);
   }
 
   static testMain() {