Fix a build failure caused by https://crrev.com/c/2599731

Bug: None
Change-Id: Ic4f42a004df7da9dd39eedbdcc9fd68389108fca
Tbr: wutao@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626942Reviewed-by: Maxim Kolosovskiy  <kolos@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842975}

chromeos/services/assistant/chromium_http_connection.cc

@@ -163,7 +163,8 @@ void ChromiumHttpConnection::Start() {
     receiver_set_.Add(this, data_remote.InitWithNewPipeAndPassReceiver());
     resource_request->request_body = new network::ResourceRequestBody();
     resource_request->request_body->SetToChunkedDataPipe(
-        std::move(data_remote));
+        std::move(data_remote),
+        network::ResourceRequestBody::ReadOnlyOnce(false));
   }
 
   url_loader_ = network::SimpleURLLoader::Create(std::move(resource_request),