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 a0150cebed12414a063b30d2bf4d9cf1821e623d..8c9730d776508a5fac1538333379c8bdd22498e5 100644
--- a/utils/tests/pub/test_pub.dart
+++ b/utils/tests/pub/test_pub.dart
@@ -1025,7 +1025,7 @@ 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));
       }
     }