Fix syntax after https://chromium-review.googlesource.com/c/chromium/src/+/1213525/

TBR=tikuta@chromium.org

Bug: 330263
Change-Id: I45e4e7597eeaf602c4cb3daafe66e73f33574cc9
Reviewed-on: https://chromium-review.googlesource.com/1213536Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589601}

tools/determinism/compare_build_artifacts.py

@@ -268,7 +268,7 @@ def compare_build_artifacts(first_dir, second_dir, ninja_path, target_platform,
     raw_whitelist = ast.literal_eval(f.read())
     whitelist_list = raw_whitelist[target_platform]
     if re.search(r'\bis_component_build\b\w*=\w*true\b',
-                 open(os.path.join(first_dir, 'args.gn').read())):
+                 open(os.path.join(first_dir, 'args.gn')).read()):
       whitelist_list += raw_whitelist.get(target_platform + '_component', [])
     whitelist = frozenset(whitelist_list)