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chromium/chrome/test/data/extensions/api_test/bindings/freeze.html 

<!doctype html>
<html>
<script>
  // Freezing the chrome object results in our lazy bindings failing. But
  // nothing should crash.
  Object.freeze(chrome);
  // Repeatedly trigger the lazy accessor to make sure nothing crashes on
  // subsequent runs (which would normally be unexpected).
  chrome.app;
  chrome.app;
  chrome.app;
</script>
</html>