Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/websockets/WorkerThreadableWebSocketChannel.cpp

Index: Source/modules/websockets/WorkerThreadableWebSocketChannel.cpp
diff --git a/Source/modules/websockets/WorkerThreadableWebSocketChannel.cpp b/Source/modules/websockets/WorkerThreadableWebSocketChannel.cpp
index 7d89c3acfdf7cf9a0291f7ef4f5b2dae4d8ef274..20969357ba20bb9654d24887eed279580fac6f46 100644
--- a/Source/modules/websockets/WorkerThreadableWebSocketChannel.cpp
+++ b/Source/modules/websockets/WorkerThreadableWebSocketChannel.cpp
@@ -222,7 +222,7 @@ void WorkerThreadableWebSocketChannel::resume()
 WorkerThreadableWebSocketChannel::Peer::Peer(PassRefPtr<WeakReference<Peer> > reference, PassRefPtr<ThreadableWebSocketChannelClientWrapper> clientWrapper, WorkerLoaderProxy& loaderProxy, ExecutionContext* context, const String& sourceURL, unsigned lineNumber, PassOwnPtr<ThreadableWebSocketChannelSyncHelper> syncHelper)
     : m_workerClientWrapper(clientWrapper)
     , m_loaderProxy(loaderProxy)
-    , m_mainWebSocketChannel(0)
+    , m_mainWebSocketChannel(nullptr)
     , m_syncHelper(syncHelper)
     , m_weakFactory(reference, this)
 {
@@ -335,7 +335,7 @@ void WorkerThreadableWebSocketChannel::Peer::disconnect()
     if (!m_mainWebSocketChannel)
         return;
     m_mainWebSocketChannel->disconnect();
-    m_mainWebSocketChannel = 0;
+    m_mainWebSocketChannel = nullptr;
 }
 
 void WorkerThreadableWebSocketChannel::Peer::suspend()
@@ -425,7 +425,7 @@ static void workerGlobalScopeDidClose(ExecutionContext* context, PassRefPtr<Thre
 void WorkerThreadableWebSocketChannel::Peer::didClose(unsigned long unhandledBufferedAmount, ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason)
 {
     ASSERT(isMainThread());
-    m_mainWebSocketChannel = 0;
+    m_mainWebSocketChannel = nullptr;
     m_loaderProxy.postTaskToWorkerGlobalScope(createCallbackTask(&workerGlobalScopeDidClose, m_workerClientWrapper, unhandledBufferedAmount, closingHandshakeCompletion, code, reason));
 }
 
@@ -576,7 +576,7 @@ bool WorkerThreadableWebSocketChannel::Bridge::waitForMethodCompletion()
 void WorkerThreadableWebSocketChannel::Bridge::terminatePeer()
 {
     m_loaderProxy.postTaskToLoader(CallClosureTask::create(bind(&Peer::destroy, m_peer)));
-    m_workerGlobalScope = 0;
+    m_workerGlobalScope = nullptr;
     m_syncHelper = 0;
 }