https://bugs.webkit.org/show_bug.cgi?id=118212

Reviewed by Andreas Kling.

To enhance readability, this patch adopts is/toHTMLOptionElement.
This also helps out to reduce duplicated use of static_cast.

Source/WebCore:

* accessibility/AccessibilityListBoxOption.cpp:
(WebCore::AccessibilityListBoxOption::isSelected):
(WebCore::AccessibilityListBoxOption::canSetSelectedAttribute):
(WebCore::AccessibilityListBoxOption::stringValue):
(WebCore::AccessibilityListBoxOption::listBoxOptionParentNode):
* accessibility/AccessibilityMenuListOption.cpp:
(WebCore::AccessibilityMenuListOption::setElement):
(WebCore::AccessibilityMenuListOption::isEnabled):
(WebCore::AccessibilityMenuListOption::isSelected):
(WebCore::AccessibilityMenuListOption::setSelected):
(WebCore::AccessibilityMenuListOption::stringValue):
* accessibility/AccessibilityMenuListPopup.cpp:
(WebCore::AccessibilityMenuListPopup::menuListOptionAccessibilityObject):
* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::accessibilityHitTest):
* css/SelectorChecker.cpp:
(WebCore::SelectorChecker::checkOne):
* css/StyleResolver.cpp:
(WebCore::StyleResolver::canShareStyleWithElement):
* html/HTMLCollection.cpp:
(WebCore::isMatchingElement):
* html/HTMLOptionElement.cpp:
(WebCore::HTMLOptionElement::index):
* html/HTMLOptionElement.h:
(WebCore::isHTMLOptionElement):
(WebCore::toHTMLOptionElement):
* html/HTMLOptionsCollection.cpp:
(WebCore::HTMLOptionsCollection::add):
* html/HTMLSelectElement.cpp:
(WebCore::HTMLSelectElement::hasPlaceholderLabelOption):
(WebCore::HTMLSelectElement::value):
(WebCore::HTMLSelectElement::setValue):
(WebCore::HTMLSelectElement::childShouldCreateRenderer):
(WebCore::HTMLSelectElement::nextValidIndex):
(WebCore::HTMLSelectElement::saveLastSelection):
(WebCore::HTMLSelectElement::setActiveSelectionAnchorIndex):
(WebCore::HTMLSelectElement::updateListBoxSelection):
(WebCore::HTMLSelectElement::listBoxOnChange):
(WebCore::HTMLSelectElement::recalcListItems):
(WebCore::HTMLSelectElement::selectedIndex):
(WebCore::HTMLSelectElement::selectOption):
(WebCore::HTMLSelectElement::optionToListIndex):
(WebCore::HTMLSelectElement::listToOptionIndex):
(WebCore::HTMLSelectElement::deselectItemsWithoutValidation):
(WebCore::HTMLSelectElement::saveFormControlState):
(WebCore::HTMLSelectElement::searchOptionsForValue):
(WebCore::HTMLSelectElement::restoreFormControlState):
(WebCore::HTMLSelectElement::appendFormData):
(WebCore::HTMLSelectElement::reset):
(WebCore::HTMLSelectElement::updateSelectedState):
(WebCore::HTMLSelectElement::lastSelectedListIndex):
(WebCore::HTMLSelectElement::optionAtIndex):
(WebCore::HTMLSelectElement::accessKeySetSelectedIndex):
(WebCore::HTMLSelectElement::length):
* html/parser/HTMLConstructionSite.cpp:
(WebCore::hasImpliedEndTag):
* html/parser/HTMLElementStack.cpp:
(WebCore::HTMLNames::isSelectScopeMarker):
* html/parser/HTMLTreeBuilder.cpp:
(WebCore::HTMLTreeBuilder::processStartTagForInBody):
(WebCore::HTMLTreeBuilder::processStartTag):
(WebCore::HTMLTreeBuilder::processEndTag):
* rendering/RenderListBox.cpp:
(WebCore::RenderListBox::updateFromElement):
(WebCore::RenderListBox::addFocusRingRects):
(WebCore::RenderListBox::paintItemForeground):
(WebCore::RenderListBox::paintItemBackground):
* rendering/RenderMenuList.cpp:
(WebCore::RenderMenuList::updateOptionsWidth):
(WebCore::RenderMenuList::setTextFromOption):
(WebCore::RenderMenuList::itemText):
(WebCore::RenderMenuList::itemIsEnabled):
(WebCore::RenderMenuList::itemIsSelected):
* rendering/RenderTheme.cpp:
(WebCore::RenderTheme::paintSliderTicks):

Source/WebKit/blackberry:

* WebKitSupport/InputHandler.cpp:
(BlackBerry::WebKit::InputHandler::willOpenPopupForNode):
(BlackBerry::WebKit::InputHandler::didNodeOpenPopup):
(BlackBerry::WebKit::InputHandler::openSelectPopup):
(BlackBerry::WebKit::InputHandler::setPopupListIndexes):
* WebKitSupport/SelectPopupClient.cpp:
(BlackBerry::WebKit::SelectPopupClient::setValueAndClosePopup):

Source/WebKit/win:

* DOMCoreClasses.cpp:
(DOMElement::createInstance):
* DOMHTMLClasses.cpp:
(DOMHTMLOptionElement::text):
(DOMHTMLOptionElement::label):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@152208 268f45cc-cd09-0410-ab3c-d52691b4dbfc