Revert 146726 "AXObjectCache gets recreated during document tear..."

Revert 146726 "AXObjectCache gets recreated during document tear..."

> AXObjectCache gets recreated during document tear-down.
> https://bugs.webkit.org/show_bug.cgi?id=112525
> 
> Reviewed by Simon Fraser.
> 
> In many cases, a document's AXObjectCache was being created after the
> document had detached, which is wasteful and could potentially lead to
> crashes because the AXObjectCache has a timer and relies on its document
> to exist.
> 
> This patch provides a way to get the existing AX object cache, instead of
> always creating a new one.
> It moves the accessibilityEnabled() checks into the axObjectCache retrieval
> for easier readability.
> It adds a number of ASSERTs to vieryf that only the correct (top) document is used
> for cache manipulation.
> 
> * accessibility/AXObjectCache.cpp:
> (WebCore::AXObjectCache::stopCachingComputedObjectAttributes):
> * dom/ContainerNode.cpp:
> (WebCore::ContainerNode::~ContainerNode):
> * dom/Document.cpp:
> (WebCore::Document::~Document):
> (WebCore::Document::clearAXObjectCache):
> (WebCore::Document::existingAXObjectCache):
> (WebCore::Document::axObjectCache):
> (WebCore::Document::setFocusedNode):
> * dom/Document.h:
> (Document):
> * dom/Element.cpp:
> (WebCore::Element::attributeChanged):
> * dom/Node.cpp:
> (WebCore::Node::~Node):
> (WebCore::Node::isEditableToAccessibility):
> (WebCore::Node::attach):
> (WebCore::Node::rootEditableElement):
> (WebCore::Node::didMoveToNewDocument):
> * editing/AppendNodeCommand.cpp:
> (WebCore::sendAXTextChangedIgnoringLineBreaks):
> * editing/DeleteFromTextNodeCommand.cpp:
> (WebCore::DeleteFromTextNodeCommand::doApply):
> (WebCore::DeleteFromTextNodeCommand::doUnapply):
> * editing/Editor.cpp:
> (WebCore::Editor::respondToChangedContents):
> (WebCore::Editor::markAndReplaceFor):
> * editing/InsertIntoTextNodeCommand.cpp:
> (WebCore::InsertIntoTextNodeCommand::doApply):
> (WebCore::InsertIntoTextNodeCommand::doUnapply):
> * editing/InsertNodeBeforeCommand.cpp:
> (WebCore::InsertNodeBeforeCommand::doApply):
> (WebCore::InsertNodeBeforeCommand::doUnapply):
> * editing/atk/FrameSelectionAtk.cpp:
> (WebCore::FrameSelection::notifyAccessibilityForSelectionChange):
> * editing/chromium/FrameSelectionChromium.cpp:
> (WebCore::FrameSelection::notifyAccessibilityForSelectionChange):
> * editing/mac/FrameSelectionMac.mm:
> (WebCore::FrameSelection::notifyAccessibilityForSelectionChange):
> * html/HTMLInputElement.cpp:
> (WebCore::HTMLInputElement::setChecked):
> * html/HTMLSelectElement.cpp:
> (WebCore::HTMLSelectElement::optionElementChildrenChanged):
> (WebCore::HTMLSelectElement::setRecalcListItems):
> * html/HTMLTextFormControlElement.cpp:
> (WebCore::HTMLTextFormControlElement::setInnerTextValue):
> * html/InputType.cpp:
> (WebCore::InputType::applyStep):
> * html/RangeInputType.cpp:
> (WebCore::RangeInputType::handleKeydownEvent):
> * loader/FrameLoader.cpp:
> (WebCore::FrameLoader::prepareForLoadStart):
> (WebCore::FrameLoader::checkLoadCompleteForThisFrame):
> * page/FocusController.cpp:
> (WebCore::FocusController::setInitialFocus):
> * page/Frame.cpp:
> (WebCore::Frame::disconnectOwnerElement):
> * page/FrameView.cpp:
> (WebCore::FrameView::removeFromAXObjectCache):
> (WebCore::FrameView::layout):
> (WebCore::FrameView::scrollToAnchor):
> (WebCore::FrameView::axObjectCache):
> * platform/ScrollView.cpp:
> (WebCore::ScrollView::setHasHorizontalScrollbar):
> (WebCore::ScrollView::setHasVerticalScrollbar):
> * platform/Scrollbar.cpp:
> (WebCore::Scrollbar::~Scrollbar):
> (WebCore):
> (WebCore::Scrollbar::existingAXObjectCache):
> * platform/Scrollbar.h:
> (Scrollbar):
> * rendering/RenderBlock.cpp:
> (WebCore::RenderBlock::deleteLineBoxTree):
> (WebCore::RenderBlock::createRootInlineBox):
> (WebCore::RenderBlock::createAndAppendRootInlineBox):
> * rendering/RenderListBox.cpp:
> (WebCore::RenderListBox::selectionChanged):
> * rendering/RenderMenuList.cpp:
> (WebCore::RenderMenuList::addChild):
> (WebCore::RenderMenuList::didUpdateActiveOption):
> * rendering/RenderObject.cpp:
> (WebCore::RenderObject::styleWillChange):
> (WebCore::RenderObject::willBeDestroyed):
> * rendering/RenderObjectChildList.cpp:
> (WebCore::RenderObjectChildList::removeChildNode):
> (WebCore::RenderObjectChildList::insertChildNode):
> * rendering/RenderText.cpp:
> (WebCore::RenderText::setText):
> * rendering/RenderWidget.cpp:
> (WebCore::RenderWidget::willBeDestroyed):
> 
> 

TBR=cfleizach@apple.com
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=146891

[kareng, 2013-03-26 15:55:59]

Committed patchset #1 manually as r146891.