Dart SDK Spelling b, c, and d.

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
index 8de85da9afb87abaa85d4cfba6691fbdb4abb57b..32410469946abab959f8abf4c8cd60455680f472 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
@@ -1342,7 +1342,7 @@ class Emitter implements js_emitter.Emitter {
       statements.add(buildDeferredHeader());
     }
 
-    // Collect the AST for the decriptors
+    // Collect the AST for the descriptors.
     Map<Element, ClassBuilder> descriptors = elementDescriptors[mainFragment];
     if (descriptors == null) descriptors = const {};