Tests that CSSParser correctly parses declarations with unterminated comments.

[expanded] 
element.style { ()
    color: red /* foo: bar;

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

[expanded] 
element.style { ()
    color: green;

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