Merge 98492 - REGRESSION (r94887): Scrolling the HTML spec is more jerky now than it was (regress...

Merge 98492 - REGRESSION (r94887): Scrolling the HTML spec is more jerky now than it was (regression)
https://bugs.webkit.org/show_bug.cgi?id=70857

Source/WebCore:

Revert r94887, because it regressed performance.

Rubber-stamped by Antti Koivisto.

* css/CSSStyleSelector.cpp:
(WebCore::CSSStyleSelector::canShareStyleWithElement):
(WebCore::parentStylePreventsSharing):
* css/SelectorChecker.cpp:
(WebCore::SelectorChecker::checkSelector):
* dom/Element.cpp:
(WebCore::Element::recalcStyle):
(WebCore::checkForSiblingStyleChanges):
* rendering/style/RenderStyle.cpp:
(WebCore::RenderStyle::RenderStyle):
* rendering/style/RenderStyle.h:
(WebCore::InheritedFlags::childrenAffectedByDirectAdjacentRules):
(WebCore::InheritedFlags::setChildrenAffectedByDirectAdjacentRules):

LayoutTests:

Rubber-stamped by Antti Koivisto.

* fast/css/adjacent-sibling-selector-expected.txt: Removed.
* fast/css/adjacent-sibling-selector.html: Removed.

TBR=dglazkov@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=98493