Change getRange to sublist. Make getRange deprecated.

utils/tests/pub/test_pub.dart

Index: utils/tests/pub/test_pub.dart
diff --git a/utils/tests/pub/test_pub.dart b/utils/tests/pub/test_pub.dart
index 6e11c63c3293562dbfeb52553c7b9c60dfe26f3d..7aec4bfe8d23121d4f5c2320bb88796349964656 100644
--- a/utils/tests/pub/test_pub.dart
+++ b/utils/tests/pub/test_pub.dart
@@ -1024,7 +1024,7 @@ class DirectoryDescriptor extends Descriptor {
 
     for (var descriptor in contents) {
       if (descriptor.name == path[0]) {
-        return descriptor.load(path.getRange(1, path.length - 1));
+        return descriptor.load(path.sublist(1));
       }
     }