Cleanup: Add more conversion helpers for usage.

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 2368 matching lines @@
                 frame->eventHandler()->defaultKeyboardEventHandler(toKeyboardEvent(event));
         }
     } else if (eventType == eventNames().clickEvent) {
         int detail = event->isUIEvent() ? static_cast<UIEvent*>(event)->detail() : 0;
         if (dispatchDOMActivateEvent(detail, event))
             event->setDefaultHandled();
     } else if (eventType == eventNames().contextmenuEvent) {
         if (Page* page = document().page())
             page->contextMenuController().handleContextMenuEvent(event);
     } else if (eventType == eventNames().textInputEvent) {
-        if (event->hasInterface(eventNames().interfaceForTextEvent))
+        if (event->hasInterface(eventNames().interfaceForTextEvent)) {
             if (Frame* frame = document().frame())
-                frame->eventHandler()->defaultTextInputEventHandler(static_cast<TextEvent*>(event));
+                frame->eventHandler()->defaultTextInputEventHandler(toTextEvent(event));
+        }
 #if OS(WIN)
     } else if (eventType == eventNames().mousedownEvent && event->isMouseEvent()) {
         MouseEvent* mouseEvent = toMouseEvent(event);
         if (mouseEvent->button() == MiddleButton) {
             if (enclosingLinkEventParentOrSelf())
                 return;
 
             RenderObject* renderer = this->renderer();
             while (renderer && (!renderer->isBox() || !toRenderBox(renderer)->canBeScrolledAndHasScrollableArea()))
                 renderer = renderer->parent();
 
             if (renderer) {
                 if (Frame* frame = document().frame())
                     frame->eventHandler()->startPanScrolling(renderer);
             }
         }
 #endif
     } else if ((eventType == eventNames().wheelEvent || eventType == eventNames().mousewheelEvent) && event->hasInterface(eventNames().interfaceForWheelEvent)) {
-        WheelEvent* wheelEvent = static_cast<WheelEvent*>(event);
+        WheelEvent* wheelEvent = toWheelEvent(event);
 
         // If we don't have a renderer, send the wheel event to the first node we find with a renderer.
         // This is needed for <option> and <optgroup> elements so that <select>s get a wheel scroll.
         Node* startNode = this;
         while (startNode && !startNode->renderer())
             startNode = startNode->parentOrShadowHostNode();
 
         if (startNode && startNode->renderer())
             if (Frame* frame = document().frame())
                 frame->eventHandler()->defaultWheelEventHandler(startNode, wheelEvent);
@@ skipping 231 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif