https://bugs.webkit.org/show_bug.cgi?id=118182

Reviewed by Andreas Kling.

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

Source/WebCore:

* accessibility/AccessibilityNodeObject.cpp:
(WebCore::AccessibilityNodeObject::isNativeImage):
* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::url):
* bindings/js/JSNodeCustom.cpp:
(WebCore::isReachableFromDOM):
* bridge/qt/qt_pixmapruntime.cpp:
(JSC::Bindings::assignToHTMLImageElement):
(JSC::Bindings::QtPixmapRuntime::toQt):
* dom/Clipboard.cpp:
(WebCore::Clipboard::setDragImage):
* dom/Node.cpp:
(WebCore::Node::enclosingLinkEventParentOrSelf):
* editing/Editor.cpp:
(WebCore::imageElementFromImageDocument):
* html/HTMLAnchorElement.cpp:
(WebCore::appendServerMapMousePosition):
* html/HTMLImageElement.h:
(WebCore::isHTMLImageElement):
(WebCore::toHTMLImageElement):
* html/HTMLMapElement.cpp:
(WebCore::HTMLMapElement::imageElement):
* html/HTMLNameCollection.cpp:
(WebCore::WindowNameCollection::nodeMatchesIfNameAttributeMatch):
(WebCore::DocumentNameCollection::nodeMatchesIfIdAttributeMatch):
(WebCore::DocumentNameCollection::nodeMatchesIfNameAttributeMatch):
(WebCore::DocumentNameCollection::nodeMatches):
* page/DragController.cpp:
(WebCore::DragController::draggableElement):
* page/PageSerializer.cpp:
(WebCore::PageSerializer::serializeFrame):
* platform/gtk/PasteboardGtk.cpp:
(WebCore::getURLForImageNode):
* platform/mac/HTMLConverter.mm:
(+[WebHTMLConverter editingAttributedStringFromRange:]):
* rendering/HitTestResult.cpp:
(WebCore::HitTestResult::altDisplayString):
(WebCore::HitTestResult::absoluteImageURL):
* rendering/RenderImage.cpp:
(WebCore::RenderImage::paintIntoRect):
(WebCore::RenderImage::imageMap):
(WebCore::RenderImage::updateAltText):
* rendering/RenderObject.cpp:
(WebCore::RenderObject::shouldRespectImageOrientation):

Source/WebKit/blackberry:

* Api/WebPage.cpp:
(BlackBerry::WebKit::WebPagePrivate::webContext):
(BlackBerry::WebKit::WebPagePrivate::blockZoomRectForNode):
(BlackBerry::WebKit::WebPage::blockZoom):
* WebKitSupport/FatFingers.cpp:
(BlackBerry::WebKit::FatFingers::isElementClickable):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@152203 268f45cc-cd09-0410-ab3c-d52691b4dbfc