Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/html/shadow/TextControlInnerElements.cpp

Index: Source/core/html/shadow/TextControlInnerElements.cpp
diff --git a/Source/core/html/shadow/TextControlInnerElements.cpp b/Source/core/html/shadow/TextControlInnerElements.cpp
index 4c362a90de0d2cef4614b7f53e6a826999eadbd4..4b420c0b20e89febb949e9749a616ab41ef1c095 100644
--- a/Source/core/html/shadow/TextControlInnerElements.cpp
+++ b/Source/core/html/shadow/TextControlInnerElements.cpp
@@ -215,7 +215,7 @@ 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);
 }
@@ -245,7 +245,7 @@ void SearchFieldCancelButtonElement::defaultEventHandler(Event* event)
     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()) {
@@ -336,7 +336,7 @@ void InputFieldSpeechButtonElement::defaultEventHandler(Event* event)
     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;
             }
         }
@@ -435,7 +435,7 @@ 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) {