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

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

Index: pkg/compiler/lib/src/js_backend/constant_emitter.dart
diff --git a/pkg/compiler/lib/src/js_backend/constant_emitter.dart b/pkg/compiler/lib/src/js_backend/constant_emitter.dart
index d4e57fb4717df427d4bd7143626ba143052935b1..55f63e92efb1cc8dd7088a7e1152e5e0b52dca26 100644
--- a/pkg/compiler/lib/src/js_backend/constant_emitter.dart
+++ b/pkg/compiler/lib/src/js_backend/constant_emitter.dart
@@ -356,7 +356,7 @@ class ConstantLiteralEmitter
   @override
   jsAst.Expression visitType(TypeConstantValue constant, [_]) {
     DartType type = constant.representedType;
-    String name = namer.getRuntimeTypeName(type.element);
+    String name = namer.runtimeTypeName(type.element);
     jsAst.Expression typeName = new jsAst.LiteralString("'$name'");
     return new jsAst.Call(getHelperProperty(backend.getCreateRuntimeType()),
                           [typeName]);