dart2js: Merge intercepted names map.

tests/compiler/dart2js/mock_libraries.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 for creating mock versions of platform and internal libraries.
 
 library mock_libraries;
 
 String buildLibrarySource(
     Map<String, String> elementMap,
@@ skipping 223 matching lines @@
 };
 
 const Map<String, String> DEFAULT_INTERCEPTORS_LIBRARY = const <String, String>{
   'findIndexForNativeSubclassType':
       'findIndexForNativeSubclassType(type) {}',
   'getDispatchProperty': 'getDispatchProperty(o) {}',
   'getInterceptor': 'getInterceptor(x) {}',
   'getNativeInterceptor': 'getNativeInterceptor(x) {}',
   'initializeDispatchProperty': 'initializeDispatchProperty(f,p,i) {}',
   'initializeDispatchPropertyCSP': 'initializeDispatchPropertyCSP(f,p,i) {}',
-  'interceptedNames': 'var interceptedNames;',
   'Interceptor': r'''
       class Interceptor {
         toString() {}
         bool operator==(other) => identical(this, other);
         get hashCode => throw "Interceptor.hashCode not implemented.";
         noSuchMethod(im) { throw im; }
       }''',
   'JSArray': r'''
           class JSArray<E> extends Interceptor implements List<E>, JSIndexable {
             JSArray();
@@ skipping 108 matching lines @@
 const Map<String, String> DEFAULT_ASYNC_LIBRARY = const <String, String>{
   'Future': 'class Future<T> {}',
   'Stream': 'class Stream<T> {}',
 };
 
 const Map<String, String> DEFAULT_MIRRORS_LIBRARY = const <String, String>{
   'Comment': 'class Comment {}',
   'MirrorSystem': 'class MirrorSystem {}',
   'MirrorsUsed': 'class MirrorsUsed {}',
 };