Only emit members in mirror helper symbolsmap.

tests/compiler/dart2js/mirror_helper_rename_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 import 'memory_compiler.dart' show compilerFor;
 import '../../../sdk/lib/_internal/compiler/implementation/apiimpl.dart' show
     Compiler;
 import
     '../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart'
@@ skipping 30 matching lines @@
 void testWithMirrorHelperLibrary({bool minify}) {
   Compiler compiler = runCompiler(useMirrorHelperLibrary: true, minify: minify);
 
   DartBackend backend = compiler.backend;
   MirrorRenamer mirrorRenamer = backend.mirrorRenamer;
   Map<Node, String> renames = backend.renames;
   Map<String, SourceString> symbols = mirrorRenamer.symbols;
 
   Expect.isFalse(null == backend.mirrorHelperLibrary);
   Expect.isFalse(null == backend.mirrorHelperGetNameFunction);
-  Expect.isTrue(symbols.containsValue(
-      const SourceString(MirrorRenamer.MIRROR_HELPER_GET_NAME_FUNCTION)));
 
   for (Node n in renames.keys) {
     if (symbols.containsKey(renames[n])) {
       if(n.toString() == 'getName') {
         Expect.equals(
             const SourceString(MirrorRenamer.MIRROR_HELPER_GET_NAME_FUNCTION),
             symbols[renames[n]]);
       } else {
         Expect.equals(n.toString(), symbols[renames[n]].stringValue);
       }
     }
   }
 
   String output = compiler.assembledCode;
   String getNameMatch = MirrorRenamer.MIRROR_HELPER_GET_NAME_FUNCTION;
   Iterable i = getNameMatch.allMatches(output);
 
 
   if (minify) {
-    Expect.equals(1, i.length);
+    Expect.equals(0, i.length);
   } else {
-    // Appears twice in code (defined & called) and twice in renames map.
-    Expect.equals(4, i.length);
+    // Appears twice in code (defined & called).
+    Expect.equals(2, i.length);
   }
 
   String mapMatch = 'const<String,SourceString>';
   i = mapMatch.allMatches(output);
   Expect.equals(1, i.length);
 }
 
 void testWithoutMirrorHelperLibrary({bool minify}) {
   Compiler compiler =
       runCompiler(useMirrorHelperLibrary: false, minify: minify);
@@ skipping 11 matching lines @@
 class Foo {
   noSuchMethod(Invocation invocation) {
     MirrorSystem.getName(invocation.memberName);
   }
 }
 
 void main() {
   new Foo().fisk();
 }
 """};