Remove deprecated PeerConnectionObserver::OnStateChange and OnIceComplete

talk/app/webrtc/peerconnectioninterface.h

Index: talk/app/webrtc/peerconnectioninterface.h
diff --git a/talk/app/webrtc/peerconnectioninterface.h b/talk/app/webrtc/peerconnectioninterface.h
index 9c0cefaca63df61fdefa48fcf06b7d2821f87cf5..940f0fb9e6f8940ada3cdaf1d6e51f2bae054287 100644
--- a/talk/app/webrtc/peerconnectioninterface.h
+++ b/talk/app/webrtc/peerconnectioninterface.h
@@ -465,11 +465,7 @@ class PeerConnectionObserver {
 
   // Triggered when the SignalingState changed.
   virtual void OnSignalingChange(
-     PeerConnectionInterface::SignalingState new_state) {}
-
-  // Triggered when SignalingState or IceState have changed.
-  // TODO(bemasc): Remove once callers transition to OnSignalingChange.
-  virtual void OnStateChange(StateType state_changed) {}
+      PeerConnectionInterface::SignalingState new_state) = 0;
 
   // Triggered when media is received on a new stream from remote peer.
   virtual void OnAddStream(MediaStreamInterface* stream) = 0;
@@ -485,19 +481,15 @@ class PeerConnectionObserver {
 
   // Called any time the IceConnectionState changes
   virtual void OnIceConnectionChange(
-      PeerConnectionInterface::IceConnectionState new_state) {}
+      PeerConnectionInterface::IceConnectionState new_state) = 0;
 
   // Called any time the IceGatheringState changes
   virtual void OnIceGatheringChange(
-      PeerConnectionInterface::IceGatheringState new_state) {}
+      PeerConnectionInterface::IceGatheringState new_state) = 0;
 
   // New Ice candidate have been found.
   virtual void OnIceCandidate(const IceCandidateInterface* candidate) = 0;
 
-  // TODO(bemasc): Remove this once callers transition to OnIceGatheringChange.
-  // All Ice candidates have been found.
-  virtual void OnIceComplete() {}
-
   // Called when the ICE connection receiving status changes.
   virtual void OnIceConnectionReceivingChange(bool receiving) {}