Split js_backend into multiple libraries

pkg/compiler/lib/src/js_backend/no_such_method_registry.dart

Index: pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
diff --git a/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart b/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
index d9e8681f376d767a38a48593e47d334e3e3872cf..d6ea7a6b3f7169bac19ae785b67b0660a77ed872 100644
--- a/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
+++ b/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
@@ -2,7 +2,14 @@
 // 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 js_backend;
+import '../common.dart';
+import '../common/names.dart' show Identifiers, Names, Selectors, Uris;
+import '../compiler.dart' show Compiler;
+import '../elements/elements.dart';
+import '../tree/tree.dart';
+import '../types/types.dart';
+
+import 'backend.dart';
 
 /**
  * Categorizes `noSuchMethod` implementations.