Use symbol literals in the mirror tests. (Except for void, the empty string and setters.)

tests/lib/mirrors/parameter_metadata_test.dart

Index: tests/lib/mirrors/parameter_metadata_test.dart
diff --git a/tests/lib/mirrors/parameter_metadata_test.dart b/tests/lib/mirrors/parameter_metadata_test.dart
index 987e0590d4e8e946bcadb05234cac7e85c547a51..f27a149dce1ff2c0ba58f332b364ac1381b84ac8 100644
--- a/tests/lib/mirrors/parameter_metadata_test.dart
+++ b/tests/lib/mirrors/parameter_metadata_test.dart
@@ -9,7 +9,7 @@ import 'dart:mirrors';
 import 'metadata_test.dart';
 
 const m1 = 'm1';
-const m2 = const Symbol('m2');
+const m2 = #m2;
 const m3 = const CustomAnnotation(3);
 
 class CustomAnnotation {
@@ -33,23 +33,23 @@ class B {
 main() {
   ClassMirror cm = reflectClass(B);
 
-  checkMetadata(cm.constructors[const Symbol('B.foo')].parameters[0], []);
+  checkMetadata(cm.constructors[#B.foo].parameters[0], []);
 
-  checkMetadata(cm.constructors[const Symbol('B.bar')].parameters[0], [m3, m2]);
-  checkMetadata(cm.constructors[const Symbol('B.bar')].parameters[1], []);
+  checkMetadata(cm.constructors[#B.bar].parameters[0], [m3, m2]);
+  checkMetadata(cm.constructors[#B.bar].parameters[1], []);
 
-  checkMetadata(cm.members[const Symbol('baz')].parameters[0], [m1]);
-  checkMetadata(cm.members[const Symbol('baz')].parameters[1], [m2]);
-  checkMetadata(cm.members[const Symbol('baz')].parameters[2], [m3]);
+  checkMetadata(cm.members[#baz].parameters[0], [m1]);
+  checkMetadata(cm.members[#baz].parameters[1], [m2]);
+  checkMetadata(cm.members[#baz].parameters[2], [m3]);
 
-  checkMetadata(cm.members[const Symbol('qux')].parameters[0], []);
-  checkMetadata(cm.members[const Symbol('qux')].parameters[1], [m3, m2, m1]);
+  checkMetadata(cm.members[#qux].parameters[0], []);
+  checkMetadata(cm.members[#qux].parameters[1], [m3, m2, m1]);
 
-  checkMetadata(cm.members[const Symbol('quux')].parameters[0], []);
-  checkMetadata(cm.members[const Symbol('quux')].parameters[1], []);
+  checkMetadata(cm.members[#quux].parameters[0], []);
+  checkMetadata(cm.members[#quux].parameters[1], []);
 
-  checkMetadata(cm.members[const Symbol('corge')].parameters[0], [m1]);
-  checkMetadata(cm.members[const Symbol('corge')].parameters[1], [m2]);
+  checkMetadata(cm.members[#corge].parameters[0], [m1]);
+  checkMetadata(cm.members[#corge].parameters[1], [m2]);
 
   checkMetadata(cm.members[const Symbol('x=')].parameters[0], [m2]);
 }