Reimplement rtc::ToString and rtc::FromString without streams.

Bug: webrtc:8982
Change-Id: I3977435b035fdebef449732301d6e77fc899e7ba
Reviewed-on: https://webrtc-review.googlesource.com/86941
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24319}
diff --git a/pc/rtcstatscollector_unittest.cc b/pc/rtcstatscollector_unittest.cc
index 178440b..3ece85f 100644
--- a/pc/rtcstatscollector_unittest.cc
+++ b/pc/rtcstatscollector_unittest.cc
@@ -586,12 +586,12 @@
     graph.sender = stats_->SetupLocalTrackAndSender(
         cricket::MEDIA_TYPE_VIDEO, "LocalVideoTrackID", 3, false);
     graph.sender_track_id = "RTCMediaStreamTrack_sender_" +
-                            rtc::ToString<>(graph.sender->AttachmentId());
+                            rtc::ToString(graph.sender->AttachmentId());
     // track (receiver) and stream (remote stream)
     graph.receiver = stats_->SetupRemoteTrackAndReceiver(
         cricket::MEDIA_TYPE_VIDEO, "RemoteVideoTrackID", "RemoteStreamId", 4);
     graph.receiver_track_id = "RTCMediaStreamTrack_receiver_" +
-                              rtc::ToString<>(graph.receiver->AttachmentId());
+                              rtc::ToString(graph.receiver->AttachmentId());
     graph.remote_stream_id = "RTCMediaStream_RemoteStreamId";
     // peer-connection
     graph.peer_connection_id = "RTCPeerConnection";
@@ -1121,7 +1121,7 @@
                                          report->timestamp_us());
   expected_pair.transport_id =
       "RTCTransport_transport_" +
-      rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTP);
+      rtc::ToString(cricket::ICE_CANDIDATE_COMPONENT_RTP);
   expected_pair.local_candidate_id = "RTCIceCandidate_" + local_candidate->id();
   expected_pair.remote_candidate_id =
       "RTCIceCandidate_" + remote_candidate->id();
@@ -1853,7 +1853,7 @@
 
   RTCTransportStats expected_rtp_transport(
       "RTCTransport_transport_" +
-          rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTP),
+          rtc::ToString(cricket::ICE_CANDIDATE_COMPONENT_RTP),
       report->timestamp_us());
   expected_rtp_transport.bytes_sent = 42;
   expected_rtp_transport.bytes_received = 1337;
@@ -1883,7 +1883,7 @@
 
   RTCTransportStats expected_rtcp_transport(
       "RTCTransport_transport_" +
-          rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTCP),
+          rtc::ToString(cricket::ICE_CANDIDATE_COMPONENT_RTCP),
       report->timestamp_us());
   expected_rtcp_transport.bytes_sent = 1337;
   expected_rtcp_transport.bytes_received = 42;