X-XSS-Protection report-uri doesn't work with mode=block
https://bugs.webkit.org/show_bug.cgi?id=105907

Reviewed by Adam Barth.

Appears to work as-is, but the test was missing for this case. Checking
for completion is complicated by the frame navigating to about:blank, rather
than the echo-report page, so check it from the parent frame.

* http/tests/security/xssAuditor/report-script-tag-full-block-expected.txt: Added.
* http/tests/security/xssAuditor/report-script-tag-full-block.html: Added.
* http/tests/security/xssAuditor/resources/echo-intertag.pl:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138645 268f45cc-cd09-0410-ab3c-d52691b4dbfc