Cleanup <static_cast>: Switch to toFoo for Accessibility Objects.

Source/core/accessibility/AccessibilityRenderObject.cpp

Index: Source/core/accessibility/AccessibilityRenderObject.cpp
diff --git a/Source/core/accessibility/AccessibilityRenderObject.cpp b/Source/core/accessibility/AccessibilityRenderObject.cpp
index e70aaf1d761db15dbcc9634d52eac35e69b0e0db..37b940232fa015d4f7754106cae7dba67b06eb7e 100644
--- a/Source/core/accessibility/AccessibilityRenderObject.cpp
+++ b/Source/core/accessibility/AccessibilityRenderObject.cpp
@@ -2216,7 +2216,7 @@ void AccessibilityRenderObject::addImageMapChildren()
     for (Element* current = ElementTraversal::firstWithin(map); current; current = ElementTraversal::next(current, map)) {
         // add an <area> element for this child if it has a link
         if (isHTMLAreaElement(current) && current->isLink()) {
-            AccessibilityImageMapLink* areaObject = static_cast<AccessibilityImageMapLink*>(axObjectCache()->getOrCreate(ImageMapLinkRole));
+            AccessibilityImageMapLink* areaObject = toAccessibilityImageMapLink(axObjectCache()->getOrCreate(ImageMapLinkRole));
             areaObject->setHTMLAreaElement(toHTMLAreaElement(current));
             areaObject->setHTMLMapElement(map);
             areaObject->setParent(this);