Refactor the way we emit no such method handlers so it's easier to optimize it later.

runtime/lib/object.dart

 // Copyright (c) 2011, 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.
 
 class Object {
   const Object();
   String toString() native "Object_toString";
   bool operator ==(other) {
     return this === other;
   }
-  void noSuchMethod(String function_name, List args) native "Object_noSuchMethod";
+  void noSuchMethod(String functionName, List args) native "Object_noSuchMethod";
 
   /**
    * Return this object without type information.
    */
   get dynamic() { return this; }
 }