Verifies that CSP issue contains source location.

Inspector issue: {
    issue : {
        code : ContentSecurityPolicyIssue
        details : {
            contentSecurityPolicyIssueDetails : {
                blockedURL : https://devtools.test:8443/inspector-protocol/resources/style.css
                contentSecurityPolicyViolationType : kURLViolation
                isReportOnly : false
                sourceCodeLocation : {
                    columnNumber : 0
                    lineNumber : 2
                    url : https://devtools.test:8443/inspector-protocol/resources/content-security-policy-issue-with-src-location.php
                }
                violatedDirective : style-src-elem
            }
        }
    }
}