Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/html/shadow/TextControlInnerElements.cpp

 /*
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * 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 197 matching lines @@
     RefPtr<SearchFieldCancelButtonElement> element = adoptRef(new SearchFieldCancelButtonElement(document));
     element->setShadowPseudoId(AtomicString("-webkit-search-cancel-button", AtomicString::ConstructFromLiteral));
     element->setAttribute(idAttr, ShadowElementNames::clearButton());
     return element.release();
 }
 
 void SearchFieldCancelButtonElement::detach(const AttachContext& context)
 {
     if (m_capturing) {
         if (Frame* frame = document().frame())
-            frame->eventHandler().setCapturingMouseEventsNode(0);
+            frame->eventHandler().setCapturingMouseEventsNode(nullptr);
     }
     HTMLDivElement::detach(context);
 }
 
 
 void SearchFieldCancelButtonElement::defaultEventHandler(Event* event)
 {
     // If the element is visible, on mouseup, clear the value, and set selection
     RefPtr<HTMLInputElement> input(toHTMLInputElement(shadowHost()));
     if (!input || input->isDisabledOrReadOnly()) {
         if (!event->defaultHandled())
             HTMLDivElement::defaultEventHandler(event);
         return;
     }
 
     if (event->type() == EventTypeNames::mousedown && event->isMouseEvent() && toMouseEvent(event)->button() == LeftButton) {
         if (renderer() && renderer()->visibleToHitTesting()) {
             if (Frame* frame = document().frame()) {
                 frame->eventHandler().setCapturingMouseEventsNode(this);
                 m_capturing = true;
             }
         }
         input->focus();
         input->select();
         event->setDefaultHandled();
     }
     if (event->type() == EventTypeNames::mouseup && event->isMouseEvent() && toMouseEvent(event)->button() == LeftButton) {
         if (m_capturing) {
             if (Frame* frame = document().frame()) {
-                frame->eventHandler().setCapturingMouseEventsNode(0);
+                frame->eventHandler().setCapturingMouseEventsNode(nullptr);
                 m_capturing = false;
             }
             if (hovered()) {
                 String oldValue = input->value();
                 input->setValueForUser("");
                 input->onSearch();
                 event->setDefaultHandled();
             }
         }
     }
@@ skipping 70 matching lines @@
         }
         RefPtr<InputFieldSpeechButtonElement> holdRefButton(this);
         input->focus();
         input->select();
         event->setDefaultHandled();
     }
     // On mouse up, release capture cleanly.
     if (event->type() == EventTypeNames::mouseup && event->isMouseEvent() && toMouseEvent(event)->button() == LeftButton) {
         if (m_capturing && renderer() && renderer()->visibleToHitTesting()) {
             if (Frame* frame = document().frame()) {
-                frame->eventHandler().setCapturingMouseEventsNode(0);
+                frame->eventHandler().setCapturingMouseEventsNode(nullptr);
                 m_capturing = false;
             }
         }
     }
 
     if (event->type() == EventTypeNames::click && m_listenerId) {
         switch (m_state) {
         case Idle:
             startSpeechInput();
             break;
@@ skipping 78 matching lines @@
     ASSERT(!m_listenerId);
     if (SpeechInput* input = SpeechInput::from(document().page()))
         m_listenerId = input->registerListener(this);
     HTMLDivElement::attach(context);
 }
 
 void InputFieldSpeechButtonElement::detach(const AttachContext& context)
 {
     if (m_capturing) {
         if (Frame* frame = document().frame())
-            frame->eventHandler().setCapturingMouseEventsNode(0);
+            frame->eventHandler().setCapturingMouseEventsNode(nullptr);
     }
 
     if (m_listenerId) {
         if (m_state != Idle)
             speechInput()->cancelRecognition(m_listenerId);
         speechInput()->unregisterListener(m_listenerId);
         m_listenerId = 0;
     }
 
     HTMLDivElement::detach(context);
@@ skipping 13 matching lines @@
 }
 
 void InputFieldSpeechButtonElement::stopSpeechInput()
 {
     if (m_state == Recording)
         speechInput()->stopRecording(m_listenerId);
 }
 #endif // ENABLE(INPUT_SPEECH)
 
 }