[fuzzer] fix names

R=machenbach@chromium.org

No-Try: true
Change-Id: I3ec0adc9be2ea09f63c12bf71803865f224fba09
Reviewed-on: https://chromium-review.googlesource.com/c/1449611
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59275}

tools/testrunner/num_fuzzer.py

@@ -153,7 +153,7 @@ class NumFuzzer(base_runner.BaseTestRunner):
       execproc,
     ]
     self._prepare_procs(procs)
-    loader.load_tests(tests, initial_batch_size=float('inf'))
+    loader.load_initial_tests(initial_batch_size=float('inf'))
 
     # TODO(majeski): maybe some notification from loader would be better?
     if combiner: