dart2js: Refactoring, documentation, and a few bugfixes in Namer class.

pkg/compiler/lib/src/js_backend/codegen/glue.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 code_generator_dependencies;
 
 import '../js_backend.dart';
 import '../../dart2jslib.dart';
 import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
@@ skipping 90 matching lines @@
   }
 
   js.Expression prototypeAccess(ClassElement e,
                                 {bool hasBeenInstantiated: false}) {
     return _emitter.prototypeAccess(e,
         hasBeenInstantiated: hasBeenInstantiated);
   }
 
 
   String getInterceptorName(Set<ClassElement> interceptedClasses) {
-    return _backend.namer.getInterceptorName(
-        getInterceptorMethod,
-        interceptedClasses);
+    return _backend.namer.nameForGetInterceptor(interceptedClasses);
   }
 
   js.Expression getInterceptorLibrary() {
     return new js.VariableUse(
         _backend.namer.globalObjectFor(_backend.interceptorsLibrary));
   }
 }