diff --git a/pc/BUILD.gn b/pc/BUILD.gn
index 4fc4254c9b..3a0a7e4edc 100644
--- a/pc/BUILD.gn
+++ b/pc/BUILD.gn
@@ -446,7 +446,6 @@ rtc_source_set("rtp_transport") {
     "../rtc_base:logging",
     "../rtc_base:socket",
     "../rtc_base/network:sent_packet",
-    "../rtc_base/third_party/sigslot",
   ]
   absl_deps = [
     "//third_party/abseil-cpp/absl/strings",
@@ -608,7 +607,6 @@ rtc_source_set("srtp_transport") {
     "../rtc_base:safe_conversions",
     "../rtc_base:zero_memory",
     "../rtc_base/third_party/base64",
-    "../rtc_base/third_party/sigslot",
   ]
   absl_deps = [
     "//third_party/abseil-cpp/absl/strings",
@@ -1134,7 +1132,6 @@ rtc_source_set("sdp_offer_answer") {
     "../rtc_base:stringutils",
     "../rtc_base:threading",
     "../rtc_base:weak_ptr",
-    "../rtc_base/third_party/sigslot",
     "../system_wrappers:metrics",
   ]
   absl_deps = [
diff --git a/pc/rtp_transport.cc b/pc/rtp_transport.cc
index 334dc4d0b2..1aa8660467 100644
--- a/pc/rtp_transport.cc
+++ b/pc/rtp_transport.cc
@@ -23,7 +23,6 @@
 #include "rtc_base/checks.h"
 #include "rtc_base/copy_on_write_buffer.h"
 #include "rtc_base/logging.h"
-#include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/trace_event.h"
 
 namespace webrtc {
diff --git a/pc/rtp_transport.h b/pc/rtp_transport.h
index 39d4ad5b54..1afcb5ee3d 100644
--- a/pc/rtp_transport.h
+++ b/pc/rtp_transport.h
@@ -28,7 +28,6 @@
 #include "rtc_base/network/sent_packet.h"
 #include "rtc_base/network_route.h"
 #include "rtc_base/socket.h"
-#include "rtc_base/third_party/sigslot/sigslot.h"
 
 namespace rtc {
 
diff --git a/pc/sdp_offer_answer.h b/pc/sdp_offer_answer.h
index 6a0aaaad27..bc5087c2b3 100644
--- a/pc/sdp_offer_answer.h
+++ b/pc/sdp_offer_answer.h
@@ -58,7 +58,6 @@
 #include "rtc_base/checks.h"
 #include "rtc_base/operations_chain.h"
 #include "rtc_base/ssl_stream_adapter.h"
-#include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread.h"
 #include "rtc_base/thread_annotations.h"
 #include "rtc_base/unique_id_generator.h"
@@ -77,8 +76,7 @@ namespace webrtc {
 // - Parsing and interpreting SDP.
 // - Generating offers and answers based on the current state.
 // This class lives on the signaling thread.
-class SdpOfferAnswerHandler : public SdpStateProvider,
-                              public sigslot::has_slots<> {
+class SdpOfferAnswerHandler : public SdpStateProvider {
  public:
   ~SdpOfferAnswerHandler();
 
diff --git a/pc/srtp_transport.cc b/pc/srtp_transport.cc
index 0991a25fb5..838040876c 100644
--- a/pc/srtp_transport.cc
+++ b/pc/srtp_transport.cc
@@ -28,7 +28,6 @@
 #include "rtc_base/numerics/safe_conversions.h"
 #include "rtc_base/ssl_stream_adapter.h"
 #include "rtc_base/third_party/base64/base64.h"
-#include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/trace_event.h"
 #include "rtc_base/zero_memory.h"
 
diff --git a/pc/test/peer_connection_test_wrapper.cc b/pc/test/peer_connection_test_wrapper.cc
index 581d0004d3..d814b323c6 100644
--- a/pc/test/peer_connection_test_wrapper.cc
+++ b/pc/test/peer_connection_test_wrapper.cc
@@ -175,8 +175,6 @@ void PeerConnectionTestWrapper::OnIceCandidate(
     const IceCandidateInterface* candidate) {
   std::string sdp;
   EXPECT_TRUE(candidate->ToString(&sdp));
-  // Give the user a chance to modify sdp for testing.
-  SignalOnIceCandidateCreated(&sdp);
   SignalOnIceCandidateReady(candidate->sdp_mid(), candidate->sdp_mline_index(),
                             sdp);
 }
@@ -196,9 +194,6 @@ void PeerConnectionTestWrapper::OnSuccess(SessionDescriptionInterface* desc) {
                    << webrtc::SdpTypeToString(desc->GetType())
                    << " sdp created: " << sdp;
 
-  // Give the user a chance to modify sdp for testing.
-  SignalOnSdpCreated(&sdp);
-
   SetLocalDescription(desc->GetType(), sdp);
 
   SignalOnSdpReady(sdp);
diff --git a/pc/test/peer_connection_test_wrapper.h b/pc/test/peer_connection_test_wrapper.h
index 4abf6c9ea5..cecd3ae8dc 100644
--- a/pc/test/peer_connection_test_wrapper.h
+++ b/pc/test/peer_connection_test_wrapper.h
@@ -99,10 +99,8 @@ class PeerConnectionTestWrapper
                           bool video);
 
   // sigslots
-  sigslot::signal1<std::string*> SignalOnIceCandidateCreated;
   sigslot::signal3<const std::string&, int, const std::string&>
       SignalOnIceCandidateReady;
-  sigslot::signal1<std::string*> SignalOnSdpCreated;
   sigslot::signal1<const std::string&> SignalOnSdpReady;
   sigslot::signal1<webrtc::DataChannelInterface*> SignalOnDataChannel;