Replace rtc::Optional with absl::optional

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

This CL generated by running script passing top level directories except rtc_base and api

find $@ -type f \( -name \*.h -o -name \*.cc -o -name \*.mm \) \
-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: I9465c172e65ba6e6ed4e4fdc35b0b265038d6f71
Reviewed-on: https://webrtc-review.googlesource.com/84584
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23697}
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCConfiguration.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCConfiguration.mm
index 4bd0450..a357085 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCConfiguration.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCConfiguration.mm
@@ -171,8 +171,8 @@
   // Generate non-default certificate.
   if (keyType != rtc::KT_DEFAULT) {
     rtc::scoped_refptr<rtc::RTCCertificate> certificate =
-        rtc::RTCCertificateGenerator::GenerateCertificate(
-            rtc::KeyParams(keyType), rtc::Optional<uint64_t>());
+        rtc::RTCCertificateGenerator::GenerateCertificate(rtc::KeyParams(keyType),
+                                                          absl::optional<uint64_t>());
     if (!certificate) {
       RTCLogError(@"Failed to generate certificate.");
       return nullptr;
@@ -184,14 +184,13 @@
   nativeConfig->presume_writable_when_fully_relayed =
       _shouldPresumeWritableWhenFullyRelayed ? true : false;
   if (_iceCheckMinInterval != nil) {
-    nativeConfig->ice_check_min_interval =
-        rtc::Optional<int>(_iceCheckMinInterval.intValue);
+    nativeConfig->ice_check_min_interval = absl::optional<int>(_iceCheckMinInterval.intValue);
   }
   if (_iceRegatherIntervalRange != nil) {
     std::unique_ptr<rtc::IntervalRange> nativeIntervalRange(
         _iceRegatherIntervalRange.nativeIntervalRange);
     nativeConfig->ice_regather_interval_range =
-        rtc::Optional<rtc::IntervalRange>(*nativeIntervalRange);
+        absl::optional<rtc::IntervalRange>(*nativeIntervalRange);
   }
   nativeConfig->sdp_semantics = [[self class] nativeSdpSemanticsForSdpSemantics:_sdpSemantics];
   if (_turnCustomizer) {
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCH264ProfileLevelId.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCH264ProfileLevelId.mm
index 33f9ae9..04a5689 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCH264ProfileLevelId.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCH264ProfileLevelId.mm
@@ -31,7 +31,7 @@
   if (self = [super init]) {
     self.hexString = hexString;
 
-    rtc::Optional<webrtc::H264::ProfileLevelId> profile_level_id =
+    absl::optional<webrtc::H264::ProfileLevelId> profile_level_id =
         webrtc::H264::ParseProfileLevelId([hexString cStringUsingEncoding:NSUTF8StringEncoding]);
     if (profile_level_id.has_value()) {
       self.profile = static_cast<RTCH264Profile>(profile_level_id->profile);
@@ -46,7 +46,7 @@
     self.profile = profile;
     self.level = level;
 
-    rtc::Optional<std::string> hex_string =
+    absl::optional<std::string> hex_string =
         webrtc::H264::ProfileLevelIdToString(webrtc::H264::ProfileLevelId(
             static_cast<webrtc::H264::Profile>(profile), static_cast<webrtc::H264::Level>(level)));
     self.hexString =
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
index c169422..bea0ede 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
@@ -470,13 +470,13 @@
               maxBitrateBps:(nullable NSNumber *)maxBitrateBps {
   webrtc::PeerConnectionInterface::BitrateParameters params;
   if (minBitrateBps != nil) {
-    params.min_bitrate_bps = rtc::Optional<int>(minBitrateBps.intValue);
+    params.min_bitrate_bps = absl::optional<int>(minBitrateBps.intValue);
   }
   if (currentBitrateBps != nil) {
-    params.current_bitrate_bps = rtc::Optional<int>(currentBitrateBps.intValue);
+    params.current_bitrate_bps = absl::optional<int>(currentBitrateBps.intValue);
   }
   if (maxBitrateBps != nil) {
-    params.max_bitrate_bps = rtc::Optional<int>(maxBitrateBps.intValue);
+    params.max_bitrate_bps = absl::optional<int>(maxBitrateBps.intValue);
   }
   return _peerConnection->SetBitrate(params).ok();
 }
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCRtpCodecParameters.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCRtpCodecParameters.mm
index b6baee6..7951cee 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCRtpCodecParameters.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCRtpCodecParameters.mm
@@ -93,10 +93,10 @@
     RTC_NOTREACHED();
   }
   if (_clockRate != nil) {
-    parameters.clock_rate = rtc::Optional<int>(_clockRate.intValue);
+    parameters.clock_rate = absl::optional<int>(_clockRate.intValue);
   }
   if (_numChannels != nil) {
-    parameters.num_channels = rtc::Optional<int>(_numChannels.intValue);
+    parameters.num_channels = absl::optional<int>(_numChannels.intValue);
   }
   for (NSString *paramKey in _parameters.allKeys) {
     std::string key = [NSString stdStringForString:paramKey];
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCRtpEncodingParameters.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCRtpEncodingParameters.mm
index 8521862..299e318 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCRtpEncodingParameters.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCRtpEncodingParameters.mm
@@ -44,13 +44,13 @@
   webrtc::RtpEncodingParameters parameters;
   parameters.active = _isActive;
   if (_maxBitrateBps != nil) {
-    parameters.max_bitrate_bps = rtc::Optional<int>(_maxBitrateBps.intValue);
+    parameters.max_bitrate_bps = absl::optional<int>(_maxBitrateBps.intValue);
   }
   if (_minBitrateBps != nil) {
-    parameters.min_bitrate_bps = rtc::Optional<int>(_minBitrateBps.intValue);
+    parameters.min_bitrate_bps = absl::optional<int>(_minBitrateBps.intValue);
   }
   if (_ssrc != nil) {
-    parameters.ssrc = rtc::Optional<uint32_t>(_ssrc.unsignedLongValue);
+    parameters.ssrc = absl::optional<uint32_t>(_ssrc.unsignedLongValue);
   }
   return parameters;
 }
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodec.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodec.mm
index 63be2dc..d752126 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodec.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodec.mm
@@ -43,9 +43,9 @@
 using namespace webrtc::H264;
 
 NSString *MaxSupportedLevelForProfile(Profile profile) {
-  const rtc::Optional<ProfileLevelId> profileLevelId = [UIDevice maxSupportedH264Profile];
+  const absl::optional<ProfileLevelId> profileLevelId = [UIDevice maxSupportedH264Profile];
   if (profileLevelId && profileLevelId->profile >= profile) {
-    const rtc::Optional<std::string> profileString =
+    const absl::optional<std::string> profileString =
         ProfileLevelIdToString(ProfileLevelId(profile, profileLevelId->level));
     if (profileString) {
       return [NSString stringForStdString:*profileString];