Fix potential use-after-move in //net/test/embedded_test_server/

Fix use-after-move (potential) bugs found by the
"bugprone-use-after-move" clang-tidy check.

Bug: 1122844
Change-Id: Id6bc188e94a56d9d7a3374a2b585b56ef00b7fe4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582322
Auto-Submit: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835724}

net/test/embedded_test_server/embedded_test_server.cc

@@ -672,7 +672,8 @@ void EmbeddedTestServer::HandleRequest(HttpConnection* connection,
     response = std::move(not_found_response);
   }
 
-  response->SendResponse(
+  HttpResponse* const response_ptr = response.get();
+  response_ptr->SendResponse(
       base::BindRepeating(&HttpConnection::SendResponseBytes,
                           connection->GetWeakPtr()),
       base::BindOnce(&EmbeddedTestServer::OnResponseCompleted,