Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/page/FocusController.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 337 matching lines @@
     if (caretBrowsing && !currentNode)
         currentNode = frame->selection().start().deprecatedNode();
 
     document->updateLayoutIgnorePendingStylesheets();
 
     RefPtr<Node> node = findFocusableNodeAcrossFocusScope(type, FocusNavigationScope::focusNavigationScopeOf(currentNode ? currentNode : document), currentNode);
 
     if (!node) {
         // We didn't find a node to focus, so we should try to pass focus to Chrome.
         if (!initialFocus && m_page->chrome().canTakeFocus(type)) {
-            document->setFocusedElement(0);
-            setFocusedFrame(0);
+            document->setFocusedElement(nullptr);
+            setFocusedFrame(nullptr);
             m_page->chrome().takeFocus(type);
             return true;
         }
 
         // Chrome doesn't want focus, so we should wrap focus.
         node = findFocusableNodeRecursively(type, FocusNavigationScope::focusNavigationScopeOf(m_page->mainFrame()->document()), 0);
         node = findFocusableNodeDecendingDownIntoFrameDocument(type, node.get());
 
         if (!node)
             return false;
@@ skipping 10 matching lines @@
         return false;
 
     Element* element = toElement(node);
     if (element->isFrameOwnerElement() && (!element->isPluginElement() || !element->isKeyboardFocusable())) {
         // We focus frames rather than frame owners.
         // FIXME: We should not focus frames that have no scrollbars, as focusing them isn't useful to the user.
         HTMLFrameOwnerElement* owner = toHTMLFrameOwnerElement(element);
         if (!owner->contentFrame())
             return false;
 
-        document->setFocusedElement(0);
+        document->setFocusedElement(nullptr);
         setFocusedFrame(owner->contentFrame());
         return true;
     }
 
     // FIXME: It would be nice to just be able to call setFocusedElement(node)
     // here, but we can't do that because some elements (e.g. HTMLInputElement
     // and HTMLTextAreaElement) do extra work in their focus() methods.
     Document& newDocument = element->document();
 
     if (&newDocument != document) {
         // Focus is going away from this document, so clear the focused node.
-        document->setFocusedElement(0);
+        document->setFocusedElement(nullptr);
     }
 
     setFocusedFrame(newDocument.frame());
 
     if (caretBrowsing) {
         Position position = firstPositionInOrBeforeNode(element);
         VisibleSelection newSelection(position, position, DOWNSTREAM);
         frame->selection().setSelection(newSelection);
     }
 
@@ skipping 230 matching lines @@
         newDocument = &element->document();
     else if (newFocusedFrame)
         newDocument = newFocusedFrame->document();
 
     if (newDocument && oldDocument == newDocument && newDocument->focusedElement() == element)
         return true;
 
     clearSelectionIfNeeded(oldFocusedFrame.get(), newFocusedFrame.get(), element);
 
     if (oldDocument && oldDocument != newDocument)
-        oldDocument->setFocusedElement(0);
+        oldDocument->setFocusedElement(nullptr);
 
     if (newFocusedFrame && !newFocusedFrame->page()) {
-        setFocusedFrame(0);
+        setFocusedFrame(nullptr);
         return false;
     }
     setFocusedFrame(newFocusedFrame);
 
     // Setting the focused node can result in losing our last reft to node when JS event handlers fire.
     RefPtr<Element> protect = element;
     if (newDocument) {
         bool successfullyFocused = newDocument->setFocusedElement(element, type);
         if (!successfullyFocused)
             return false;
@@ skipping 235 matching lines @@
         startingRect = nodeRectInAbsoluteCoordinates(container, true /* ignore border */);
         container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(type, container);
         if (container && container->isDocumentNode())
             toDocument(container)->updateLayoutIgnorePendingStylesheets();
     } while (!consumed && container);
 
     return consumed;
 }
 
 } // namespace WebCore