Fix indentation (reindent.py).
diff --git a/Lib/lib2to3/pgen2/grammar.py b/Lib/lib2to3/pgen2/grammar.py
index 52cdbc0..321e25e 100644
--- a/Lib/lib2to3/pgen2/grammar.py
+++ b/Lib/lib2to3/pgen2/grammar.py
@@ -139,12 +139,12 @@
 
 def _make_deterministic(top):
     if isinstance(top, dict):
-      return collections.OrderedDict(
-          sorted(((k, _make_deterministic(v)) for k, v in top.items())))
+        return collections.OrderedDict(
+            sorted(((k, _make_deterministic(v)) for k, v in top.items())))
     if isinstance(top, list):
-      return [_make_deterministic(e) for e in top]
+        return [_make_deterministic(e) for e in top]
     if isinstance(top, tuple):
-      return tuple(_make_deterministic(e) for e in top)
+        return tuple(_make_deterministic(e) for e in top)
     return top