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chromium/third_party/blink/web_tests/http/tests/security/XFrameOptions/x-frame-options-deny-multiple-clients.html 

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if (window.testRunner)
    testRunner.dumpAsText();
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Test that two main resources pointing to the same url that are canceled within didReceiveResponse() don't cause us to crash.

<iframe src="http://127.0.0.1:8000/security/XFrameOptions/resources/x-frame-options-deny.cgi" onload="alert('PASS: onload fired.');"></iframe>
<iframe src="http://127.0.0.1:8000/security/XFrameOptions/resources/x-frame-options-deny.cgi" onload="alert('PASS: onload fired.');"></iframe>
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