Revert merge_pyi change that doesn't appear to be needed anymore.

I ran the CI workflow with this change reverted, and it still passes.

PiperOrigin-RevId: 547294484

pytype/tools/merge_pyi/merge_pyi_test.py

@@ -3,7 +3,6 @@
 import logging
 import os
 import re
-import sys
 
 from pytype.platform_utils import path_utils
 from pytype.tools.merge_pyi import merge_pyi
@@ -16,9 +15,6 @@
 PY, PYI, EXPECTED = 'py', 'pyi', 'pep484.py'
 OVERWRITE_EXPECTED = 0  # flip to regenerate expected files
 
-# Some tests are sensitive to the libcst version
-SKIP_BEFORE_310 = {'pyi_variations'}
-
 
 def load_tests(unused_loader, standard_tests, unused_pattern):
   root = path_utils.join(path_utils.dirname(__file__), 'test_data')
@@ -42,9 +38,6 @@ def build(self, data_dir):
       if not OVERWRITE_EXPECTED and EXPECTED not in files_by_ext:
         continue
 
-      if sys.version_info < (3, 10) and base in SKIP_BEFORE_310:
-        continue
-
       py, pyi = (files_by_ext[x] for x in (PY, PYI))
       outfile = path_utils.join(data_dir, base + '.' + EXPECTED)