Adding missing #include on absl/memory/memory.h.

These two files were using absl::make_unique without #including the
header that declares it.

Bug: None
Change-Id: I03019c9a7e06370631680b474d04dd33716b0fe3
Reviewed-on: https://webrtc-review.googlesource.com/c/107041
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25266}
diff --git a/test/test_main_lib.cc b/test/test_main_lib.cc
index add24af..23a1c2b 100644
--- a/test/test_main_lib.cc
+++ b/test/test_main_lib.cc
@@ -13,6 +13,7 @@
 #include <fstream>
 #include <string>
 
+#include "absl/memory/memory.h"
 #include "rtc_base/flags.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/thread.h"