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

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

Index: pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
diff --git a/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart b/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
index 9f10524d1b2abc421d9508b23bbd175fe95a66d7..f5e7a9d50829017b50c49a449051789d5911c8db 100644
--- a/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
+++ b/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
@@ -291,8 +291,7 @@ class InterceptorStubGenerator {
     Selector selector = backend.oneShotInterceptors[name];
     Set<ClassElement> classes =
         backend.getInterceptedClassesOn(selector.name);
-    String getInterceptorName =
-        namer.getInterceptorName(backend.getInterceptorMethod, classes);
+    String getInterceptorName = namer.getInterceptorName(classes);
 
     List<String> parameterNames = <String>[];
     parameterNames.add('receiver');