Add WebSocket unittests.

Source/modules/websockets/WebSocketHandshake.cpp

Index: Source/modules/websockets/WebSocketHandshake.cpp
diff --git a/Source/modules/websockets/WebSocketHandshake.cpp b/Source/modules/websockets/WebSocketHandshake.cpp
index 480caa74348400db501d5a02cbdac3af64aa81e4..5b920aff4d0c4fc578b2d93fbf5699731da9016a 100644
--- a/Source/modules/websockets/WebSocketHandshake.cpp
+++ b/Source/modules/websockets/WebSocketHandshake.cpp
@@ -533,7 +533,7 @@ bool WebSocketHandshake::checkResponseHeaders()
             return false;
         }
         Vector<String> result;
-        m_clientProtocol.split(String(WebSocket::subProtocolSeperator()), result);
+        m_clientProtocol.split(String(WebSocket::subprotocolSeperator()), result);
         if (!result.contains(serverWebSocketProtocol)) {
             m_failureReason = formatHandshakeFailureReason("'Sec-WebSocket-Protocol' header value '" + serverWebSocketProtocol + "' in response does not match any of sent values");
             return false;