Remove our stream << overloads from non-test build targets.

Most are removed entirely, but RtcErrorType, RtpTransceiverDirection, IPAddress and
SocketAddress are kept behind gtest's #ifdef UNIT_TEST.

Bug: webrtc:8982
Change-Id: I36db19891e7d25aeacb08b9a08aa2b4004765e70
Reviewed-on: https://webrtc-review.googlesource.com/64143
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Reviewed-by: Benjamin Wright <benwright@webrtc.org>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22916}

modules/video_coding/codecs/h264/include/h264_globals.h

@@ -53,11 +53,6 @@ inline std::string ToString(H264PacketizationMode mode) {
   return "";
 }
 
-inline std::ostream& operator<<(std::ostream& stream,
-                                H264PacketizationMode mode) {
-  return stream << ToString(mode);
-}
-
 struct NaluInfo {
   uint8_t type;
   int sps_id;