Remove rtc::Optional alias and api:optional target

Update left-overs where old target still was used.

Bug: webrtc:9078
Change-Id: I2162c928091fc4ff1dea33a3f03adbe47207d206
Reviewed-on: https://webrtc-review.googlesource.com/84740
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23913}
diff --git a/modules/audio_coding/neteq/tools/neteq_input.cc b/modules/audio_coding/neteq/tools/neteq_input.cc
index 12a75fc..fed3ecc 100644
--- a/modules/audio_coding/neteq/tools/neteq_input.cc
+++ b/modules/audio_coding/neteq/tools/neteq_input.cc
@@ -34,12 +34,12 @@
       start_time_ms_(input_->NextEventTime()),
       duration_ms_(duration_ms) {}
 
-rtc::Optional<int64_t> TimeLimitedNetEqInput::NextPacketTime() const {
-  return ended_ ? rtc::Optional<int64_t>() : input_->NextPacketTime();
+absl::optional<int64_t> TimeLimitedNetEqInput::NextPacketTime() const {
+  return ended_ ? absl::nullopt : input_->NextPacketTime();
 }
 
-rtc::Optional<int64_t> TimeLimitedNetEqInput::NextOutputEventTime() const {
-  return ended_ ? rtc::Optional<int64_t>() : input_->NextOutputEventTime();
+absl::optional<int64_t> TimeLimitedNetEqInput::NextOutputEventTime() const {
+  return ended_ ? absl::nullopt : input_->NextOutputEventTime();
 }
 
 std::unique_ptr<NetEqInput::PacketData> TimeLimitedNetEqInput::PopPacket() {
@@ -62,8 +62,8 @@
   return ended_ || input_->ended();
 }
 
-rtc::Optional<RTPHeader> TimeLimitedNetEqInput::NextHeader() const {
-  return ended_ ? rtc::Optional<RTPHeader>() : input_->NextHeader();
+absl::optional<RTPHeader> TimeLimitedNetEqInput::NextHeader() const {
+  return ended_ ? absl::nullopt : input_->NextHeader();
 }
 
 void TimeLimitedNetEqInput::MaybeSetEnded() {
diff --git a/modules/audio_coding/neteq/tools/neteq_input.h b/modules/audio_coding/neteq/tools/neteq_input.h
index a13a86e..1691585 100644
--- a/modules/audio_coding/neteq/tools/neteq_input.h
+++ b/modules/audio_coding/neteq/tools/neteq_input.h
@@ -84,18 +84,18 @@
 class TimeLimitedNetEqInput : public NetEqInput {
  public:
   TimeLimitedNetEqInput(std::unique_ptr<NetEqInput> input, int64_t duration_ms);
-  rtc::Optional<int64_t> NextPacketTime() const override;
-  rtc::Optional<int64_t> NextOutputEventTime() const override;
+  absl::optional<int64_t> NextPacketTime() const override;
+  absl::optional<int64_t> NextOutputEventTime() const override;
   std::unique_ptr<PacketData> PopPacket() override;
   void AdvanceOutputEvent() override;
   bool ended() const override;
-  rtc::Optional<RTPHeader> NextHeader() const override;
+  absl::optional<RTPHeader> NextHeader() const override;
 
  private:
   void MaybeSetEnded();
 
   std::unique_ptr<NetEqInput> input_;
-  const rtc::Optional<int64_t> start_time_ms_;
+  const absl::optional<int64_t> start_time_ms_;
   const int64_t duration_ms_;
   bool ended_ = false;
 };