Tests that the inspected page does not crash after inspecting element with CSSOM added rules. Bug 373508 crbug.com/373508

[expanded] 
element.style { ()

[expanded] 
#box { (<style>)
    background: red;
    color: white;

[expanded] 
div { (<style>)
    border: 1px solid black;
/-- overloaded --/     background-color: white;
    padding: 20px;

[expanded] 
div { (user agent stylesheet)
    display: block;
    unicode-bidi: isolate;