Wrap program into (function(){ <prog> })() instead of !function...().

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart

 // Copyright (c) 2014, 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 dart2js.new_js_emitter.model_emitter;
 
 import '../../constants/values.dart' show ConstantValue, FunctionConstantValue;
 import '../../dart2jslib.dart' show Compiler;
 import '../../elements/elements.dart' show ClassElement, FunctionElement;
 import '../../js/js.dart' as js;
@@ skipping 886 matching lines @@
     return output;
   }
 
   static final String setupProgramName = "setupProgram";
 
   static final String boilerplate = """
 {
 // Declare deferred-initializer global.
 #deferredInitializer;
 
-!function(start, program) {
+(function(start, program) {
   // Initialize holder objects.
   #holders;
   var nativeInfos = Object.create(null);
 
   // Counter to generate unique names for tear offs.
   var functionCounter = 0;
 
   function $setupProgramName(program, typesOffset) {
     for (var i = 0; i < program.length - 2; i++) {
       setupLibrary(program[i], typesOffset);
@@ skipping 313 matching lines @@
   #nativeIsolateAffinityTagInitialization;
 
   // Initialize eager classes.
   #eagerClasses;
 
   var end = Date.now();
   // print('Setup: ' + (end - start) + ' ms.');
 
   #invokeMain;  // Start main.
 
-}(Date.now(), #code)
+})(Date.now(), #code)
 }""";
 
 }