dart2js: remove (broken) support for nsm on native classes.

pkg/compiler/lib/src/js_emitter/native_emitter.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js.js_emitter;
 
 class NativeEmitter {
 
   final Map<Element, ClassBuilder> cachedBuilders;
 
   final CodeEmitterTask emitterTask;
 
   // Whether the application contains native classes.
   bool hasNativeClasses = false;
 
   // Caches the native subtypes of a native class.
   Map<ClassElement, List<ClassElement>> subtypes;
 
   // Caches the direct native subtypes of a native class.
   Map<ClassElement, List<ClassElement>> directSubtypes;
 
   // Caches the methods that have a native body.
   Set<FunctionElement> nativeMethods;
 
-  // Do we need the native emitter to take care of handling
-  // noSuchMethod for us? This flag is set to true in the emitter if
-  // it finds any native class that needs noSuchMethod handling.
-  bool handleNoSuchMethod = false;
-
   NativeEmitter(CodeEmitterTask emitterTask)
       : this.emitterTask = emitterTask,
         subtypes = new Map<ClassElement, List<ClassElement>>(),
         directSubtypes = new Map<ClassElement, List<ClassElement>>(),
         nativeMethods = new Set<FunctionElement>(),
         cachedBuilders = emitterTask.compiler.cacheStrategy.newMap();
 
   Compiler get compiler => emitterTask.compiler;
   JavaScriptBackend get backend => compiler.backend;
 
@@ skipping 431 matching lines @@
           }
     ''', {'info': infoAccess,
           'constructor': constructorAccess,
           'subclassRead': subclassRead,
           'interceptorsByTagAccess': interceptorsByTagAccess,
           'leafTagsAccess': leafTagsAccess,
           'nativeSuperclassTagName': embeddedNames.NATIVE_SUPERCLASS_TAG_NAME,
           'allowNativesSubclassing': true});
   }
 }