Rename toScriptElement -> toScriptElementIfPossible
https://bugs.webkit.org/show_bug.cgi?id=113473

Reviewed by Ryosuke Niwa.

Rename ScriptElement::toScriptElement to ScriptElement::toScriptElementIfPossible to
differentiate this function from other to*Element functions, and to better describe the
function's behavior. Other to*Element functions do not return null if the cast fails,
whereas toScriptElementIfPossible does.

No new tests as this is just a refactoring.

* dom/ScriptElement.cpp:
(WebCore::toScriptElementIfPossible):
* dom/ScriptElement.h:
(WebCore):
* dom/ScriptRunner.cpp:
(WebCore::ScriptRunner::timerFired):

    This is the only unchecked return value but there isn't a security issue here.

* html/HTMLOptionElement.cpp:
(WebCore::HTMLOptionElement::collectOptionInnerText):
* html/parser/HTMLConstructionSite.cpp:
(WebCore::HTMLConstructionSite::attachLater):
(WebCore::HTMLConstructionSite::insertForeignElement):
* html/parser/HTMLScriptRunner.cpp:
(WebCore::HTMLScriptRunner::executePendingScriptAndDispatchEvent):
(WebCore::HTMLScriptRunner::requestPendingScript):
(WebCore::HTMLScriptRunner::runScript):
* xml/parser/XMLDocumentParser.cpp:
(WebCore::XMLDocumentParser::notifyFinished):
* xml/parser/XMLDocumentParserLibxml2.cpp:
(WebCore::XMLDocumentParser::startElementNs):
(WebCore::XMLDocumentParser::endElementNs):
* xml/parser/XMLDocumentParserQt.cpp:
(WebCore::XMLDocumentParser::parseStartElement):
(WebCore::XMLDocumentParser::parseEndElement):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147057 268f45cc-cd09-0410-ab3c-d52691b4dbfc