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/api/BUILD.gn b/api/BUILD.gn
index 0cfa592..13ab187 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -560,6 +560,7 @@
     deps = [
       ":libjingle_peerconnection_api",
       "../rtc_base:checks",
+      "../third_party/abseil-cpp/absl/memory:memory",
     ]
   }