Simplify runtime type support.

sdk/lib/_internal/compiler/implementation/js_backend/namer.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
index 3d134c2327ea8f6ba893bcb3126f064b31fce5a8..16ae7fb7fd63bc41020e52c178dc471a4fa33d6f 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
@@ -313,7 +313,6 @@ class Namer {
     } else {
       name = element.name.slowToString();
     }
-    // Prefix the name with '$' if it is reserved.
     return name;
   }
 
@@ -363,7 +362,6 @@ class Namer {
     } else {
       // Use declaration element to ensure invariant on [globals].
       element = element.declaration;
-
       // Dealing with a top-level or static element.
       String cached = globals[element];
       if (cached != null) return cached;