Replace rtc::Optional with absl::optional in modules/audio_coding

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

This CL generated by running script with parameter 'modules/audio_coding'

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: Ic980ee605148fdb160666d4aa03cc87175e48fe8
Reviewed-on: https://webrtc-review.googlesource.com/84130
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23659}
diff --git a/modules/audio_coding/neteq/decoder_database_unittest.cc b/modules/audio_coding/neteq/decoder_database_unittest.cc
index a6b9689..afd10ae 100644
--- a/modules/audio_coding/neteq/decoder_database_unittest.cc
+++ b/modules/audio_coding/neteq/decoder_database_unittest.cc
@@ -29,7 +29,7 @@
 
 TEST(DecoderDatabase, CreateAndDestroy) {
   DecoderDatabase db(new rtc::RefCountedObject<MockAudioDecoderFactory>,
-                     rtc::nullopt);
+                     absl::nullopt);
   EXPECT_EQ(0, db.Size());
   EXPECT_TRUE(db.Empty());
 }
@@ -42,7 +42,7 @@
         EXPECT_EQ("pcmu", format.name);
         return true;
       }));
-  DecoderDatabase db(factory, rtc::nullopt);
+  DecoderDatabase db(factory, absl::nullopt);
   const uint8_t kPayloadType = 0;
   const std::string kCodecName = "Robert\'); DROP TABLE Students;";
   EXPECT_EQ(
@@ -67,7 +67,7 @@
         EXPECT_EQ("pcma", format.name);
         return true;
       }));
-  DecoderDatabase db(factory, rtc::nullopt);
+  DecoderDatabase db(factory, absl::nullopt);
   const std::string kCodecName1 = "Robert\'); DROP TABLE Students;";
   const std::string kCodecName2 = "https://xkcd.com/327/";
   EXPECT_EQ(DecoderDatabase::kOK,
@@ -92,12 +92,12 @@
   auto* decoder = new MockAudioDecoder;
   EXPECT_CALL(*factory, MakeAudioDecoderMock(_, _, _))
       .WillOnce(Invoke([decoder](const SdpAudioFormat& format,
-                                 rtc::Optional<AudioCodecPairId> codec_pair_id,
+                                 absl::optional<AudioCodecPairId> codec_pair_id,
                                  std::unique_ptr<AudioDecoder>* dec) {
         EXPECT_EQ("pcmu", format.name);
         dec->reset(decoder);
       }));
-  DecoderDatabase db(factory, rtc::nullopt);
+  DecoderDatabase db(factory, absl::nullopt);
   const uint8_t kPayloadType = 0;
   const std::string kCodecName = "Robert\'); DROP TABLE Students;";
   EXPECT_EQ(
@@ -114,7 +114,7 @@
 }
 
 TEST(DecoderDatabase, GetDecoder) {
-  DecoderDatabase db(CreateBuiltinAudioDecoderFactory(), rtc::nullopt);
+  DecoderDatabase db(CreateBuiltinAudioDecoderFactory(), absl::nullopt);
   const uint8_t kPayloadType = 0;
   const std::string kCodecName = "Robert\'); DROP TABLE Students;";
   EXPECT_EQ(DecoderDatabase::kOK,
@@ -132,7 +132,7 @@
         EXPECT_EQ("pcmu", format.name);
         return true;
       }));
-  DecoderDatabase db(factory, rtc::nullopt);
+  DecoderDatabase db(factory, absl::nullopt);
   const uint8_t kPayloadTypePcmU = 0;
   const uint8_t kPayloadTypeCng = 13;
   const uint8_t kPayloadTypeDtmf = 100;
@@ -168,7 +168,7 @@
 
 TEST(DecoderDatabase, ExternalDecoder) {
   DecoderDatabase db(new rtc::RefCountedObject<MockAudioDecoderFactory>,
-                     rtc::nullopt);
+                     absl::nullopt);
   const uint8_t kPayloadType = 0;
   const std::string kCodecName = "Robert\'); DROP TABLE Students;";
   MockAudioDecoder decoder;
@@ -205,7 +205,7 @@
         EXPECT_EQ("pcmu", format.name);
         return true;
       }));
-  DecoderDatabase db(factory, rtc::nullopt);
+  DecoderDatabase db(factory, absl::nullopt);
   // Load a number of payloads into the database. Payload types are 0, 1, ...,
   // while the decoder type is the same for all payload types (this does not
   // matter for the test).
@@ -245,7 +245,7 @@
 
 // Test the methods for setting and getting active speech and CNG decoders.
 TEST(DecoderDatabase, IF_ISAC(ActiveDecoders)) {
-  DecoderDatabase db(CreateBuiltinAudioDecoderFactory(), rtc::nullopt);
+  DecoderDatabase db(CreateBuiltinAudioDecoderFactory(), absl::nullopt);
   // Load payload types.
   ASSERT_EQ(DecoderDatabase::kOK,
             db.RegisterPayload(0, NetEqDecoder::kDecoderPCMu, "pcmu"));