Revert of RTCOutboundRTPStreamStats added.

webrtc/stats/rtcstats.cc

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/api/stats/rtcstats.h"
 
-#include <sstream>
-
 #include "webrtc/base/stringencode.h"
 
 namespace webrtc {
 
 namespace {
 
 // Produces "{ a, b, c }". Works for non-vector |RTCStatsMemberInterface::Type|
 // types.
 template<typename T>
 std::string VectorToString(const std::vector<T>& vector) {
@@ skipping 123 matching lines @@
     std::vector<uint64_t>, kSequenceUint64, true, false,
     VectorToString(value_));
 WEBRTC_DEFINE_RTCSTATSMEMBER(
     std::vector<double>, kSequenceDouble, true, false,
     VectorToString(value_));
 WEBRTC_DEFINE_RTCSTATSMEMBER(
     std::vector<std::string>, kSequenceString, true, false,
     VectorOfStringsToString(value_));
 
 }  // namespace webrtc