nonwebby-scheme-in-img-allowed.https.html

<!DOCTYPE html>
<html>
<body>
<p>
    This tests that non-webby subresource URLs are not blocked as
    mixed content. The test passes if the load proceeds without
    warning. The test fails if a mixed content error or warning is
    displayed, and/or the load is blocked.
</p>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.dumpChildFrames();
    testRunner.overridePreference("WebKitAllowRunningInsecureContent", false);
}
</script>
<img src="nonwebbyscheme://this-will-fail-but-no-mixed-content-error-should-appear"/>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/security/mixedContent/nonwebby-scheme-in-img-allowed.https.html