[tools] Port testrunner/testproc/filter.py to PY3

Bug: chromium:1245634
Change-Id: I48eb590fa8c75fe2eded6b85dab6680efb751fd0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3199873
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77193}

tools/testrunner/testproc/filter.py

@@ -70,7 +70,7 @@ class NameFilterProc(base.TestProcFilter):
       else:
         self._exact_matches[suitename][path] = True
 
-    for s, globs in self._globs.iteritems():
+    for s, globs in list(self._globs.items()):
       if not globs or '*' in globs:
         self._globs[s] = ['*']