Remove redundant close().

Bug: None
Change-Id: I975f14a4308530e37cc3faba67d8545ed3feffa8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/269005
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Auto-Submit: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37581}

test/test_main_lib.cc

@@ -183,7 +183,6 @@ class TestMainImpl : public TestMain {
     if (!result_filename.empty()) {
       std::ofstream result_file(result_filename);
       result_file << "{\"version\": 3}";
-      result_file.close();
     }
 #endif