Include absl/memory/memory.h if absl::make_unique is used

Tbr: kwiberg@webrtc.org
Bug: None
Change-Id: Iaf4533d2ce0e80b351a8a664ef8cf7ba0e5ec583
Reviewed-on: https://webrtc-review.googlesource.com/c/115746
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Yves Gerey <yvesg@google.com>
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26168}

modules/video_coding/codecs/h264/h264.cc

@@ -13,6 +13,7 @@
 
 #include <string>
 
+#include "absl/memory/memory.h"
 #include "absl/types/optional.h"
 #include "api/video_codecs/sdp_video_format.h"
 #include "common_types.h"  // NOLINT(build/include)

modules/video_coding/codecs/test/videocodec_test_openh264.cc

@@ -10,6 +10,7 @@
 
 #include <vector>
 
+#include "absl/memory/memory.h"
 #include "api/test/create_videocodec_test_fixture.h"
 #include "media/base/mediaconstants.h"
 #include "modules/video_coding/codecs/test/videocodec_test_fixture_impl.h"

modules/video_coding/codecs/test/videocodec_test_videotoolbox.cc

@@ -10,6 +10,7 @@
 
 #include <vector>
 
+#include "absl/memory/memory.h"
 #include "api/test/create_videocodec_test_fixture.h"
 #include "media/base/mediaconstants.h"
 #include "modules/video_coding/codecs/test/objc_codec_factory_helper.h"