Delete almost all default methods on PeerConnectionInterface

Keeping default implementations only for methods involved in
ongoing transitions.

Intended to catch inconsistencies between the interface and the
PeerConnectionProxy class, at compile time.

Bug: webrtc:10716
Change-Id: I4cb126c353855f7288ba09273fa6f87aaa0f32eb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/140860
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29224}

pc/test/fake_peer_connection_base.h

@@ -52,6 +52,11 @@ class FakePeerConnectionBase : public PeerConnectionInternal {
 
   bool RemoveTrack(RtpSenderInterface* sender) override { return false; }
 
+  RTCError RemoveTrackNew(
+      rtc::scoped_refptr<RtpSenderInterface> sender) override {
+    return RTCError(RTCErrorType::UNSUPPORTED_OPERATION);
+  }
+
   RTCErrorOr<rtc::scoped_refptr<RtpTransceiverInterface>> AddTransceiver(
       rtc::scoped_refptr<MediaStreamTrackInterface> track) override {
     return RTCError(RTCErrorType::UNSUPPORTED_OPERATION, "Not implemented");
@@ -200,6 +205,14 @@ class FakePeerConnectionBase : public PeerConnectionInternal {
     return IceConnectionState::kIceConnectionNew;
   }
 
+  IceConnectionState standardized_ice_connection_state() override {
+    return IceConnectionState::kIceConnectionNew;
+  }
+
+  PeerConnectionState peer_connection_state() override {
+    return PeerConnectionState::kNew;
+  }
+
   IceGatheringState ice_gathering_state() override {
     return IceGatheringState::kIceGatheringNew;
   }
@@ -209,6 +222,10 @@ class FakePeerConnectionBase : public PeerConnectionInternal {
     return false;
   }
 
+  bool StartRtcEventLog(std::unique_ptr<RtcEventLogOutput> output) override {
+    return false;
+  }
+
   void StopRtcEventLog() override {}
 
   void Close() override {}