REGRESSION (r53857): Crash when tabbing to <map>

REGRESSION (r53857): Crash when tabbing to <map>
https://bugs.webkit.org/show_bug.cgi?id=36017

Reviewed by Darin Adler.

WebCore:

Test: fast/events/imagemap-norender-crash.html

* html/HTMLMapElement.cpp:
(WebCore::HTMLMapElement::imageElement):

LayoutTests:

Also fix the path to js-test-post.js in tab-imagemap.html.

* fast/events/imagemap-norender-crash-expected.txt: Added.
* fast/events/imagemap-norender-crash.html: Added.
* fast/events/tab-imagemap-expected.txt:
* fast/events/tab-imagemap.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@56094 268f45cc-cd09-0410-ab3c-d52691b4dbfc