dart2js: Make usage of names more consistent between compiler and runtime.

sdk/lib/_internal/compiler/js_lib/js_helper.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.
 
 library _js_helper;
 
 import 'shared/embedded_names.dart' show
     ALL_CLASSES,
     GET_ISOLATE_TAG,
     INTERCEPTED_NAMES,
@@ skipping 2013 matching lines @@
         '',
         'function(f,r){'
           'return function(){'
             'return f.apply({\$receiver:r(this)},arguments)'
           '}'
         '}(#,#)', functionType, getReceiver);
     } else {
       throw 'Error in reflectionInfo.';
     }
 
-    JS('', '#.\$signature = #', prototype, signatureFunction);
+    JS('', '#[#] = #', prototype, JS_SIGNATURE_NAME(), signatureFunction);
 
     JS('', '#[#] = #', prototype, callName, trampoline);
     for (int i = 1; i < functions.length; i++) {
       var stub = functions[i];
       var stubCallName = JS('String|Null', '#.\$callName', stub);
       if (stubCallName != null) {
         JS('', '#[#] = #', prototype, stubCallName,
            isStatic ? stub : forwardCallTo(receiver, stub, isIntercepted));
       }
     }
@@ skipping 1357 matching lines @@
   throw new MainError("No top-level function named 'main'.");
 }
 
 void badMain() {
   throw new MainError("'main' is not a function.");
 }
 
 void mainHasTooManyParameters() {
   throw new MainError("'main' expects too many parameters.");
 }