WebCore: Fixes part of <http://webkit.org/b/30522>.

WebCore: Fixes part of <webkit.org/b/30522>.
Web Inspector: DOM Exceptions throughout the Inspector should be more human readable.

Reviewed by Eric Seidel.

Expose the description attribute that is now a member of
ExceptionBase as of r49723, so when a user logs an exception, they
can see the description in the Web Inspector.

Test: fast/dom/dom-exception-description.html

* dom/DOMCoreException.idl:
* dom/EventException.idl:
* dom/RangeException.idl:
* svg/SVGException.idl:
* xml/XMLHttpRequestException.idl:
* xml/XPathException.idl:

LayoutTests: Fixes part of <http://webkit.org/b/30522>.
Web Inspector: DOM Exceptions throughout the Inspector should be more human readable.

Reviewed by Eric Seidel.

Adds a test to check the name and description of some DOM Exceptions.

* fast/dom/dom-exception-description-expected.txt: Added.
* fast/dom/dom-exception-description.html: Added.
* fast/dom/script-tests/dom-exception-description.js: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@49922 268f45cc-cd09-0410-ab3c-d52691b4dbfc