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

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

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index 5279a74f499e883357e4a5e10c5440dcc8a2d304..4e702b177e92dd9b71ce9f6f83316d44083c931e 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -547,7 +547,7 @@ class JavaScriptBackend extends Backend {
 
   String registerOneShotInterceptor(Selector selector) {
     Set<ClassElement> classes = getInterceptedClassesOn(selector.name);
-    String name = namer.getOneShotInterceptorName(selector, classes);
+    String name = namer.nameForGetOneShotInterceptor(selector, classes);
     if (!oneShotInterceptors.containsKey(name)) {
       registerSpecializedGetInterceptor(classes);
       oneShotInterceptors[name] = selector;
@@ -746,7 +746,7 @@ class JavaScriptBackend extends Backend {
   }
 
   void registerSpecializedGetInterceptor(Set<ClassElement> classes) {
-    String name = namer.getInterceptorName(getInterceptorMethod, classes);
+    String name = namer.nameForGetInterceptor(classes);
     if (classes.contains(jsInterceptorClass)) {
       // We can't use a specialized [getInterceptorMethod], so we make
       // sure we emit the one with all checks.