Fix crash in network_service.

mojo/services/network/http_connection_impl.cc

Index: mojo/services/network/http_connection_impl.cc
diff --git a/mojo/services/network/http_connection_impl.cc b/mojo/services/network/http_connection_impl.cc
index be306cd0c2e7a1c69d38c8f1ca8f7bdc5f88b0de..0831d1d7a888bad97dcfad5faaaa7553acb0cfd9 100644
--- a/mojo/services/network/http_connection_impl.cc
+++ b/mojo/services/network/http_connection_impl.cc
@@ -141,8 +141,9 @@ void HttpConnectionImpl::OnReceivedHttpRequest(
         if (response->body.is_valid()) {
           SimpleDataPipeReader* reader = new SimpleDataPipeReader;
           response_body_readers_.insert(reader);
+          ScopedDataPipeConsumerHandle body = response->body.Pass();
           reader->Start(
-              response->body.Pass(),
+              body.Pass(),
               base::Bind(&HttpConnectionImpl::OnFinishedReadingResponseBody,
                          base::Unretained(this), base::Passed(&response)));
         } else {