dtrace: fix removal of unused probes

Fixes Windows compile failures introduced in d75fecf6f

PR-URL: https://github.com/iojs/io.js/pull/703
Reviewed-By: Rod Vagg <rod@vagg.org>

src/node_win32_etw_provider-inl.h

@@ -257,8 +257,6 @@ bool NODE_HTTP_CLIENT_REQUEST_ENABLED() { return events_enabled > 0; }
 bool NODE_HTTP_CLIENT_RESPONSE_ENABLED() { return events_enabled > 0; }
 bool NODE_NET_SERVER_CONNECTION_ENABLED() { return events_enabled > 0; }
 bool NODE_NET_STREAM_END_ENABLED() { return events_enabled > 0; }
-bool NODE_NET_SOCKET_READ_ENABLED() { return events_enabled > 0; }
-bool NODE_NET_SOCKET_WRITE_ENABLED() { return events_enabled > 0; }
 bool NODE_V8SYMBOL_ENABLED() { return events_enabled > 0; }
 
 }  // namespace node