Rename [call$...] properties to [$...] in compiled code.

sdk/lib/_internal/lib/js_mirrors.dart

Index: sdk/lib/_internal/lib/js_mirrors.dart
diff --git a/sdk/lib/_internal/lib/js_mirrors.dart b/sdk/lib/_internal/lib/js_mirrors.dart
index 687699314ea6d66de5ee861b97af6c0a02bd3fb4..313b456e29c3555ae89724fa89bd1180f023917b 100644
--- a/sdk/lib/_internal/lib/js_mirrors.dart
+++ b/sdk/lib/_internal/lib/js_mirrors.dart
@@ -2045,14 +2045,17 @@ class JsClosureMirror extends JsInstanceMirror implements ClosureMirror {
     if (cachedFunction != null) return cachedFunction;
     disableTreeShaking();
     // TODO(ahe): What about optional parameters (named or not).
+    String callPrefix = "${JS_GET_NAME("CALL_PREFIX")}\$";
     var extractCallName = JS('', r'''
 function(reflectee) {
   for (var property in reflectee) {
-    if ("call$" == property.substring(0, 5)) return property;
+    if (# == property.substring(0, #) &&
+        property[#] >= '0' &&
+        property[#] <= '9') return property;
   }
   return null;
 }
-''');
+''', callPrefix, callPrefix.length, callPrefix.length, callPrefix.length);
     String callName = JS('String|Null', '#(#)', extractCallName, reflectee);
     if (callName == null) {
       throw new RuntimeError('Cannot find callName on "$reflectee"');