Update symbol test to have proper expectations.

dart/tests/corelib/symbol_test.dart

Index: dart/tests/corelib/symbol_test.dart
diff --git a/dart/tests/corelib/symbol_test.dart b/dart/tests/corelib/symbol_test.dart
index a160244d4786aaace8e3d318dd6abad137efabf0..0bdb09463416e64b2fbb1f75d2cc1cbed66f7d19 100644
--- a/dart/tests/corelib/symbol_test.dart
+++ b/dart/tests/corelib/symbol_test.dart
@@ -10,8 +10,8 @@ main() {
 
   try {
     print(const Symbol(0)); /// 01: compile-time error
-  } on ArgumentError {
-    print('Caught ArgumentError');
+  } on NoSuchMethodError {
+    print('Caught NoSuchMethodError');
   } on TypeError {
     print('Caught TypeError');
   }
@@ -31,9 +31,9 @@ main() {
   try {
     var y = 0;
     print(new Symbol(y));
-    throw 'Expected an ArgumentError or a TypeError';
-  } on ArgumentError {
-    print('Caught ArgumentError');
+    throw 'Expected a NoSuchMethodError or a TypeError';
+  } on NoSuchMethodError {
+    print('Caught NoSuchMethodError');
   } on TypeError {
     print('Caught TypeError');
   }