Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/page/EventSource.cpp

 /*
  * Copyright (C) 2009, 2012 Ericsson AB. All rights reserved.
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011, Code Aurora Forum. 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
@@ skipping 58 matching lines @@
     , m_reconnectDelay(defaultReconnectDelay)
 {
     ScriptWrappable::init(this);
     eventSourceInit.get("withCredentials", m_withCredentials);
 }
 
 PassRefPtr<EventSource> EventSource::create(ExecutionContext* context, const String& url, const Dictionary& eventSourceInit, ExceptionState& exceptionState)
 {
     if (url.isEmpty()) {
         exceptionState.throwDOMException(SyntaxError, "Cannot open an EventSource to an empty URL.");
-        return 0;
+        return nullptr;
     }
 
     KURL fullURL = context->completeURL(url);
     if (!fullURL.isValid()) {
         exceptionState.throwDOMException(SyntaxError, "Cannot open an EventSource to '" + url + "'. The URL is invalid.");
-        return 0;
+        return nullptr;
     }
 
     // FIXME: Convert this to check the isolated world's Content Security Policy once webkit.org/b/104520 is solved.
     bool shouldBypassMainWorldContentSecurityPolicy = false;
     if (context->isDocument()) {
         Document* document = toDocument(context);
         shouldBypassMainWorldContentSecurityPolicy = document->frame()->script().shouldBypassMainWorldContentSecurityPolicy();
     }
     if (!shouldBypassMainWorldContentSecurityPolicy && !context->contentSecurityPolicy()->allowConnectToSource(fullURL)) {
         // We can safely expose the URL to JavaScript, as this exception is generate synchronously before any redirects take place.
         exceptionState.throwSecurityError("Refused to connect to '" + fullURL.elidedString() + "' because it violates the document's Content Security Policy.");
-        return 0;
+        return nullptr;
     }
 
     RefPtr<EventSource> source = adoptRef(new EventSource(context, fullURL, eventSourceInit));
 
     source->setPendingActivity(source.get());
     source->scheduleInitialConnect();
     source->suspendIfNeeded();
 
     return source.release();
 }
@@ skipping 318 matching lines @@
 
 PassRefPtr<MessageEvent> EventSource::createMessageEvent()
 {
     RefPtr<MessageEvent> event = MessageEvent::create();
     event->initMessageEvent(m_eventName.isEmpty() ? EventTypeNames::message : m_eventName, false, false, SerializedScriptValue::create(String(m_data)), m_eventStreamOrigin, m_lastEventId, 0, nullptr);
     m_data.clear();
     return event.release();
 }
 
 } // namespace WebCore