Oilpan: add explicit Persistent<T>(T&) and Member<T>(T&) constructors.

Source/modules/websockets/WebSocketChannel.cpp

Index: Source/modules/websockets/WebSocketChannel.cpp
diff --git a/Source/modules/websockets/WebSocketChannel.cpp b/Source/modules/websockets/WebSocketChannel.cpp
index 305346a8cdc1ee5ce8fbfe5daba6c395dbd84c09..4cc0ee1ef14eb628fb6905187e44ef1a15bc9b93 100644
--- a/Source/modules/websockets/WebSocketChannel.cpp
+++ b/Source/modules/websockets/WebSocketChannel.cpp
@@ -63,7 +63,7 @@ PassRefPtr<WebSocketChannel> WebSocketChannel::create(ExecutionContext* context,
 
     if (context->isWorkerGlobalScope()) {
         WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
-        return WorkerThreadableWebSocketChannel::create(workerGlobalScope, client, sourceURL, lineNumber);
+        return WorkerThreadableWebSocketChannel::create(*workerGlobalScope, client, sourceURL, lineNumber);
     }
 
     Document* document = toDocument(context);