Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/editing/InputMethodController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 66 matching lines @@
     return m_compositionNode && m_compositionNode->isContentEditable();
 }
 
 inline Editor& InputMethodController::editor() const
 {
     return m_frame.editor();
 }
 
 void InputMethodController::clear()
 {
-    m_compositionNode = 0;
+    m_compositionNode = nullptr;
     m_customCompositionUnderlines.clear();
 }
 
 bool InputMethodController::insertTextForConfirmedComposition(const String& text)
 {
     return m_frame.eventHandler().handleTextInputEvent(text, 0, TextEventInputComposition);
 }
 
 void InputMethodController::selectComposition() const
 {
@@ skipping 106 matching lines @@
         target->dispatchEvent(event, IGNORE_EXCEPTION);
     }
 
     // If text is empty, then delete the old composition here. If text is non-empty, InsertTextCommand::input
     // will delete the old composition with an optimized replace operation.
     if (text.isEmpty() && mode != CancelComposition) {
         ASSERT(m_frame.document());
         TypingCommand::deleteSelection(*m_frame.document(), 0);
     }
 
-    m_compositionNode = 0;
+    m_compositionNode = nullptr;
     m_customCompositionUnderlines.clear();
 
     insertTextForConfirmedComposition(text);
 
     if (mode == CancelComposition) {
         // An open typing command that disagrees about current selection would cause issues with typing later on.
         TypingCommand::closeTyping(&m_frame);
     }
 
     return true;
@@ skipping 47 matching lines @@
             target->dispatchEvent(event, IGNORE_EXCEPTION);
     }
 
     // If text is empty, then delete the old composition here. If text is non-empty, InsertTextCommand::input
     // will delete the old composition with an optimized replace operation.
     if (text.isEmpty()) {
         ASSERT(m_frame.document());
         TypingCommand::deleteSelection(*m_frame.document(), TypingCommand::PreventSpellChecking);
     }
 
-    m_compositionNode = 0;
+    m_compositionNode = nullptr;
     m_customCompositionUnderlines.clear();
 
     if (!text.isEmpty()) {
         ASSERT(m_frame.document());
         TypingCommand::insertText(*m_frame.document(), text, TypingCommand::SelectInsertedText | TypingCommand::PreventSpellChecking, TypingCommand::TextCompositionUpdate);
 
         // Find out what node has the composition now.
         Position base = m_frame.selection().base().downstream();
         Position extent = m_frame.selection().extent();
         Node* baseNode = base.deprecatedNode();
@@ skipping 21 matching lines @@
         }
     }
 }
 
 void InputMethodController::setCompositionFromExistingText(const Vector<CompositionUnderline>& underlines, unsigned compositionStart, unsigned compositionEnd)
 {
     Node* editable = m_frame.selection().rootEditableElement();
     Position base = m_frame.selection().base().downstream();
     Node* baseNode = base.anchorNode();
     if (editable->firstChild() == baseNode && editable->lastChild() == baseNode && baseNode->isTextNode()) {
-        m_compositionNode = 0;
+        m_compositionNode = nullptr;
         m_customCompositionUnderlines.clear();
 
         if (base.anchorType() != Position::PositionIsOffsetInAnchor)
             return;
         if (!baseNode || baseNode != m_frame.selection().extent().anchorNode())
             return;
 
         m_compositionNode = toText(baseNode);
         m_compositionStart = compositionStart;
         m_compositionEnd = compositionEnd;
@@ skipping 10 matching lines @@
 
     Editor::RevealSelectionScope revealSelectionScope(&editor());
     SelectionOffsetsScope selectionOffsetsScope(this);
     setSelectionOffsets(PlainTextRange(compositionStart, compositionEnd));
     setComposition(m_frame.selectedText(), underlines, 0, 0);
 }
 
 PassRefPtr<Range> InputMethodController::compositionRange() const
 {
     if (!hasComposition())
-        return 0;
+        return nullptr;
     unsigned length = m_compositionNode->length();
     unsigned start = std::min(m_compositionStart, length);
     unsigned end = std::min(std::max(start, m_compositionEnd), length);
     if (start >= end)
-        return 0;
+        return nullptr;
     return Range::create(m_compositionNode->document(), m_compositionNode.get(), start, m_compositionNode.get(), end);
 }
 
 PlainTextRange InputMethodController::getSelectionOffsets() const
 {
     RefPtr<Range> range = m_frame.selection().selection().firstRange();
     if (!range)
         return PlainTextRange();
     Node* editable = m_frame.selection().rootEditableElementOrTreeScopeRootNode();
     ASSERT(editable);
@@ skipping 27 matching lines @@
     if (!editor().canEdit())
         return;
     PlainTextRange selectionOffsets(getSelectionOffsets());
     if (selectionOffsets.isNull())
         return;
     setSelectionOffsets(PlainTextRange(std::max(static_cast<int>(selectionOffsets.start()) - before, 0), selectionOffsets.end() + after));
     TypingCommand::deleteSelection(*m_frame.document());
 }
 
 } // namespace WebCore