Move optional.h to webrtc/api/
We use Optional in our public API, so its header should be in
webrtc/api/.
BUG=webrtc:8205
Review-Url: https://codereview.webrtc.org/3011943002
Cr-Commit-Position: refs/heads/master@{#19693}
diff --git a/webrtc/modules/audio_coding/neteq/packet_buffer.h b/webrtc/modules/audio_coding/neteq/packet_buffer.h
index afd5f04..5c2499c 100644
--- a/webrtc/modules/audio_coding/neteq/packet_buffer.h
+++ b/webrtc/modules/audio_coding/neteq/packet_buffer.h
@@ -11,10 +11,10 @@
#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_BUFFER_H_
#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_BUFFER_H_
+#include "webrtc/api/optional.h"
#include "webrtc/modules/audio_coding/neteq/packet.h"
#include "webrtc/modules/include/module_common_types.h"
#include "webrtc/rtc_base/constructormagic.h"
-#include "webrtc/rtc_base/optional.h"
#include "webrtc/typedefs.h"
namespace webrtc {