http://trac.webkit.org/changeset/134367
https://bugs.webkit.org/show_bug.cgi?id=100738

Speculative rollout, could have cause Dromaeo setAttribute
perf regression.

PerformanceTests:

* DOM/ModifyAttribute.html: Removed.
* DOM/resources/dom-perf/modify-attribute.js: Removed.

Source/WebCore:

* dom/Element.cpp:
(WebCore::Element::attributeChanged):
(WebCore::checkNeedsStyleInvalidationForClassChange):
(WebCore::Element::classAttributeChanged):

LayoutTests:

* fast/dom/shadow/distribution-attribute-modified-expected.html: Removed.
* fast/dom/shadow/distribution-attribute-modified.html: Removed.
* fast/dom/shadow/distribution-className-modified-expected.html: Removed.
* fast/dom/shadow/distribution-className-modified.html: Removed.
* fast/dom/shadow/distribution-id-modified-expected.html: Removed.
* fast/dom/shadow/distribution-id-modified.html: Removed.
* fast/dom/shadow/reprojection-attribute-modified-expected.html: Removed.
* fast/dom/shadow/reprojection-attribute-modified.html: Removed.
* fast/dom/shadow/reprojection-className-modified-expected.html: Removed.
* fast/dom/shadow/reprojection-className-modified.html: Removed.
* fast/dom/shadow/reprojection-id-modified-expected.html: Removed.
* fast/dom/shadow/reprojection-id-modified.html: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@134443 268f45cc-cd09-0410-ab3c-d52691b4dbfc