diff --git a/pc/connection_context.h b/pc/connection_context.h
index 415ae121b5..0fe20c7890 100644
--- a/pc/connection_context.h
+++ b/pc/connection_context.h
@@ -32,10 +32,6 @@
 #include "rtc_base/thread.h"
 #include "rtc_base/thread_annotations.h"
 
-namespace cricket {
-class ChannelManager;
-}
-
 namespace rtc {
 class BasicPacketSocketFactory;
 class UniqueRandomIdGenerator;
diff --git a/pc/media_session.h b/pc/media_session.h
index 3711110ccd..6548f9c436 100644
--- a/pc/media_session.h
+++ b/pc/media_session.h
@@ -46,7 +46,6 @@ class ConnectionContext;
 
 namespace cricket {
 
-class ChannelManager;
 class MediaEngineInterface;
 
 // Default RTCP CNAME for unit tests.
diff --git a/pc/peer_connection.h b/pc/peer_connection.h
index 7d0eb18781..39a240da4f 100644
--- a/pc/peer_connection.h
+++ b/pc/peer_connection.h
@@ -84,10 +84,6 @@
 #include "rtc_base/thread_annotations.h"
 #include "rtc_base/weak_ptr.h"
 
-namespace cricket {
-class ChannelManager;
-}
-
 namespace webrtc {
 
 // PeerConnection is the implementation of the PeerConnection object as defined
diff --git a/pc/peer_connection_factory.h b/pc/peer_connection_factory.h
index 036329f57a..9bed5ba105 100644
--- a/pc/peer_connection_factory.h
+++ b/pc/peer_connection_factory.h
@@ -46,10 +46,6 @@
 #include "rtc_base/thread.h"
 #include "rtc_base/thread_annotations.h"
 
-namespace cricket {
-class ChannelManager;
-}
-
 namespace rtc {
 class BasicNetworkManager;
 class BasicPacketSocketFactory;
diff --git a/pc/rtp_transceiver.h b/pc/rtp_transceiver.h
index 625d0a52c5..0844b349b6 100644
--- a/pc/rtp_transceiver.h
+++ b/pc/rtp_transceiver.h
@@ -47,7 +47,6 @@
 #include "rtc_base/thread_annotations.h"
 
 namespace cricket {
-class ChannelManager;
 class MediaEngineInterface;
 }
 
diff --git a/pc/rtp_transmission_manager.h b/pc/rtp_transmission_manager.h
index c48b345c16..06ce4feeaf 100644
--- a/pc/rtp_transmission_manager.h
+++ b/pc/rtp_transmission_manager.h
@@ -40,10 +40,6 @@
 #include "rtc_base/thread_annotations.h"
 #include "rtc_base/weak_ptr.h"
 
-namespace cricket {
-class ChannelManager;
-}
-
 namespace rtc {
 class Thread;
 }
diff --git a/pc/sdp_offer_answer.h b/pc/sdp_offer_answer.h
index c493dc0229..2124ed8697 100644
--- a/pc/sdp_offer_answer.h
+++ b/pc/sdp_offer_answer.h
@@ -63,10 +63,6 @@
 #include "rtc_base/unique_id_generator.h"
 #include "rtc_base/weak_ptr.h"
 
-namespace cricket {
-class ChannelManager;
-}
-
 namespace webrtc {
 
 // SdpOfferAnswerHandler is a component
@@ -569,7 +565,6 @@ class SdpOfferAnswerHandler : public SdpStateProvider {
 
   // ==================================================================
   // Access to pc_ variables
-  cricket::ChannelManager* channel_manager() const;
   cricket::MediaEngineInterface* media_engine() const;
   TransceiverList* transceivers();
   const TransceiverList* transceivers() const;