Replace rtc::Optional with absl::optional in audio, call and video

This is a no-op change because rtc::Optional is an alias to absl::optional

This CL generated by running script with parameters 'audio call video':
#!/bin/bash
find $@ -type f \( -name \*.h -o -name \*.cc \) \
-exec sed -i 's|rtc::Optional|absl::optional|g' {} \+ \
-exec sed -i 's|rtc::nullopt|absl::nullopt|g' {} \+ \
-exec sed -i 's|#include "api/optional.h"|#include "absl/types/optional.h"|' {} \+

find $@ -type f -name BUILD.gn \
-exec sed -r -i 's|"(../)*api:optional"|"//third_party/abseil-cpp/absl/types:optional"|' {} \+;

git cl format

Bug: webrtc:9078
Change-Id: I02c5db956846a88a268a300ba086703a02d62e36
Reviewed-on: https://webrtc-review.googlesource.com/83722
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23628}
diff --git a/audio/transport_feedback_packet_loss_tracker_unittest.cc b/audio/transport_feedback_packet_loss_tracker_unittest.cc
index 8f8fe05..b190c62 100644
--- a/audio/transport_feedback_packet_loss_tracker_unittest.cc
+++ b/audio/transport_feedback_packet_loss_tracker_unittest.cc
@@ -94,18 +94,18 @@
   // value is as expected.
   void ValidatePacketLossStatistics(
       const TransportFeedbackPacketLossTracker& tracker,
-      rtc::Optional<float> expected_plr,
-      rtc::Optional<float> expected_rplr) {
-    // TODO(eladalon): Comparing the rtc::Optional<float> directly would have
+      absl::optional<float> expected_plr,
+      absl::optional<float> expected_rplr) {
+    // TODO(eladalon): Comparing the absl::optional<float> directly would have
     // given concise code, but less readable error messages. If we modify
-    // the way rtc::Optional is printed, we can get rid of this.
-    rtc::Optional<float> plr = tracker.GetPacketLossRate();
+    // the way absl::optional is printed, we can get rid of this.
+    absl::optional<float> plr = tracker.GetPacketLossRate();
     EXPECT_EQ(static_cast<bool>(expected_plr), static_cast<bool>(plr));
     if (expected_plr && plr) {
       EXPECT_EQ(*expected_plr, *plr);
     }
 
-    rtc::Optional<float> rplr = tracker.GetRecoverablePacketLossRate();
+    absl::optional<float> rplr = tracker.GetRecoverablePacketLossRate();
     EXPECT_EQ(static_cast<bool>(expected_rplr), static_cast<bool>(rplr));
     if (expected_rplr && rplr) {
       EXPECT_EQ(*expected_rplr, *rplr);
@@ -127,7 +127,7 @@
   TransportFeedbackPacketLossTracker tracker(kDefaultMaxWindowSizeMs, 5, 5);
 
   // PLR and RPLR reported as unknown before reception of first feedback.
-  ValidatePacketLossStatistics(tracker, rtc::nullopt, rtc::nullopt);
+  ValidatePacketLossStatistics(tracker, absl::nullopt, absl::nullopt);
 }
 
 // A feedback received for an empty window has no effect.
@@ -136,7 +136,7 @@
 
   // Feedback doesn't correspond to any packets - ignored.
   AddTransportFeedbackAndValidate(&tracker, base_, {true, false, true});
-  ValidatePacketLossStatistics(tracker, rtc::nullopt, rtc::nullopt);
+  ValidatePacketLossStatistics(tracker, absl::nullopt, absl::nullopt);
 
   // After the packets are transmitted, acking them would have an effect.
   SendPackets(&tracker, base_, 3, kDefaultSendIntervalMs);
@@ -153,7 +153,7 @@
   // Expected window contents: [] -> [1001].
   SendPackets(&tracker, base_, 3, kDefaultSendIntervalMs);
   AddTransportFeedbackAndValidate(&tracker, base_, {true, false, false, true});
-  ValidatePacketLossStatistics(tracker, rtc::nullopt, rtc::nullopt);
+  ValidatePacketLossStatistics(tracker, absl::nullopt, absl::nullopt);
 }
 
 // Sanity check on minimum filled window - PLR known, RPLR unknown.
@@ -166,7 +166,7 @@
   SendPackets(&tracker, base_, 5, kDefaultSendIntervalMs);
   AddTransportFeedbackAndValidate(&tracker, base_,
                                   {true, false, false, true, true});
-  ValidatePacketLossStatistics(tracker, 2.0f / 5.0f, rtc::nullopt);
+  ValidatePacketLossStatistics(tracker, 2.0f / 5.0f, absl::nullopt);
 }
 
 // Sanity check on minimum filled window - PLR unknown, RPLR known.
@@ -179,7 +179,7 @@
   SendPackets(&tracker, base_, 5, kDefaultSendIntervalMs);
   AddTransportFeedbackAndValidate(&tracker, base_,
                                   {true, false, false, true, true});
-  ValidatePacketLossStatistics(tracker, rtc::nullopt, 1.0f / 4.0f);
+  ValidatePacketLossStatistics(tracker, absl::nullopt, 1.0f / 4.0f);
 }
 
 // If packets are sent close enough together that the clock reading for both
@@ -203,7 +203,7 @@
   // Expected window contents: [] -> [10011].
   AddTransportFeedbackAndValidate(&tracker, base_,
                                   {true, false, false, true, true});
-  ValidatePacketLossStatistics(tracker, 2.0f / 5.0f, rtc::nullopt);
+  ValidatePacketLossStatistics(tracker, 2.0f / 5.0f, absl::nullopt);
 
   // Expected window contents: [10011] -> [1001110101].
   AddTransportFeedbackAndValidate(&tracker, base_ + 5,
@@ -520,7 +520,7 @@
   // A reset occurs.
   SendPackets(&tracker, {static_cast<uint16_t>(base_ + 2)},
               kDefaultSendIntervalMs);
-  ValidatePacketLossStatistics(tracker, rtc::nullopt, rtc::nullopt);
+  ValidatePacketLossStatistics(tracker, absl::nullopt, absl::nullopt);
 }
 
 // The window is reset by the sending of a packet which is 0x8000 or more
@@ -539,7 +539,7 @@
   // A reset occurs.
   SendPackets(&tracker, {static_cast<uint16_t>(base_ + 5 + 0x8000)},
               kDefaultSendIntervalMs);
-  ValidatePacketLossStatistics(tracker, rtc::nullopt, rtc::nullopt);
+  ValidatePacketLossStatistics(tracker, absl::nullopt, absl::nullopt);
 }
 
 #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)