Change getRange to sublist. Make getRange deprecated.

sdk/lib/_internal/dartdoc/lib/universe_serializer.dart

Index: sdk/lib/_internal/dartdoc/lib/universe_serializer.dart
diff --git a/sdk/lib/_internal/dartdoc/lib/universe_serializer.dart b/sdk/lib/_internal/dartdoc/lib/universe_serializer.dart
index 24633fdb5f287de40958e7fad3836f0ece30e594..b88c9ead7749a9031930839b8a194d3514561c5e 100755
--- a/sdk/lib/_internal/dartdoc/lib/universe_serializer.dart
+++ b/sdk/lib/_internal/dartdoc/lib/universe_serializer.dart
@@ -213,7 +213,7 @@ class LibraryElement extends Element {
       }
 
       var libDir = parts.lastIndexOf('lib');
-      var rest = parts.getRange(libDir + 1, parts.length - libDir - 1);
+      var rest = parts.sublist(libDir + 1);
 
       // If there's no lib, we can't find the package.
       if (libDir < 0 || libDir < packageDir) {