[tools/perf] Remove default values of benchmark_dirs and top_level_dir in chromium_config module

tools/perf/run_benchmark

Index: tools/perf/run_benchmark
diff --git a/tools/perf/run_benchmark b/tools/perf/run_benchmark
index 228405ff6361cb67523cd39f80c2b665219edacb..00fb6af885a2268184929f8111e8d0df6ee1b690 100755
--- a/tools/perf/run_benchmark
+++ b/tools/perf/run_benchmark
@@ -15,8 +15,11 @@ from chrome_telemetry_build import chromium_config
 
 
 def main():
-  config = chromium_config.ChromiumConfig()
+  config = chromium_config.ChromiumConfig(
+      benchmark_dirs=[path_util.GetPerfBenchmarksDir()],
+      top_level_dir=path_util.GetPerfDir())
   return benchmark_runner.main(config, [trybot_command.Trybot])
 
+
 if __name__ == '__main__':
   sys.exit(main())