Dart SDK Spelling b, c, and d.

tools/dom/src/native_DOMImplementation.dart

Index: tools/dom/src/native_DOMImplementation.dart
diff --git a/tools/dom/src/native_DOMImplementation.dart b/tools/dom/src/native_DOMImplementation.dart
index 2338aeef8d24f8b023b8543626256b8ade074f11..a97d3f2dda957eedb339130a07b2665d3cbc8319 100644
--- a/tools/dom/src/native_DOMImplementation.dart
+++ b/tools/dom/src/native_DOMImplementation.dart
@@ -610,7 +610,7 @@ class _Utils {
   }
 
   /**
-   * Adds all candidate String completitions from [declarations] to [output]
+   * Adds all candidate String completions from [declarations] to [output]
    * filtering based on [staticContext] and [includePrivate].
    */
   static void _getCompletionsHelper(ClassMirror classMirror, bool staticContext,
@@ -688,7 +688,7 @@ class _Utils {
   }
 
   /**
-   * Get valid code completitions from within a library and all libraries
+   * Get valid code completions from within a library and all libraries
    * imported by that library.
    */
   static List<String> getLibraryCompletionsIncludingImports(String url) {