Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/bindings/v8/V8Initializer.cpp

Index: Source/bindings/v8/V8Initializer.cpp
diff --git a/Source/bindings/v8/V8Initializer.cpp b/Source/bindings/v8/V8Initializer.cpp
index f7c7343ae81ee4bfd31c1c2f16418f25e6ba0708..8cd5f5cdb78569e0265ee3e32a3261909b264092 100644
--- a/Source/bindings/v8/V8Initializer.cpp
+++ b/Source/bindings/v8/V8Initializer.cpp
@@ -207,7 +207,7 @@ static void messageHandlerInWorker(v8::Handle<v8::Message> message, v8::Handle<v
         AccessControlStatus corsStatus = message->IsSharedCrossOrigin() ? SharableCrossOrigin : NotSharableCrossOrigin;
 
         V8ErrorHandler::storeExceptionOnErrorEventWrapper(event.get(), data, isolate);
-        context->reportException(event.release(), 0, corsStatus);
+        context->reportException(event.release(), nullptr, corsStatus);
     }
 
     isReportingException = false;