Remove obsolete IceProtocolType enum and SetIceProtocolType

which only had a single member after the removal of
GICE around M42. The last downstream usage in Chromoting
was removed in
  https://chromium-review.googlesource.com/c/chromium/src/+/4385113

BUG=webrtc:4299

Change-Id: Id444967822cd19b0e514ba70739a8d45a7f78fae
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/299600
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#39945}

Author: fippo

p2p/base/ice_transport_internal.h

@@ -228,12 +228,6 @@ enum class IceTransportState {
   STATE_FAILED
 };
 
-// TODO(zhihuang): Remove this once it's no longer used in
-// remoting/protocol/libjingle_transport_factory.cc
-enum IceProtocolType {
-  ICEPROTO_RFC5245  // Standard RFC 5245 version of ICE.
-};
-
 // IceTransportInternal is an internal abstract class that does ICE.
 // Once the public interface is supported,
 // (https://www.w3.org/TR/webrtc/#rtcicetransport)
@@ -256,10 +250,6 @@ class RTC_EXPORT IceTransportInternal : public rtc::PacketTransportInternal {
 
   virtual void SetIceTiebreaker(uint64_t tiebreaker) = 0;
 
-  // TODO(zhihuang): Remove this once it's no longer called in
-  // remoting/protocol/libjingle_transport_factory.cc
-  virtual void SetIceProtocolType(IceProtocolType type) {}
-
   virtual void SetIceCredentials(absl::string_view ice_ufrag,
                                  absl::string_view ice_pwd);