[tools] Clean up predictable wrapper py2 code

No-Try: true
Bug: chromium:1292013
Change-Id: I5e30116230d88f2f38d20451735c5713691f2af2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3521791Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81764}

tools/predictable_wrapper.py

@@ -14,11 +14,6 @@ The command is run up to three times and the printed allocation hash is
 compared. Differences are reported as errors.
 """
 
-
-# for py2/py3 compatibility
-from __future__ import absolute_import
-from __future__ import print_function
-
 import sys
 
 from testrunner.local import command