Revert to allowing only 1 unsignaled receive stream for audio.

webrtc/media/engine/webrtcvoiceengine.cc

 /*
  *  Copyright (c) 2004 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.
  */
 
@@ skipping 29 matching lines @@
 #include "webrtc/modules/audio_mixer/audio_mixer_impl.h"
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 #include "webrtc/system_wrappers/include/field_trial.h"
 #include "webrtc/system_wrappers/include/metrics.h"
 #include "webrtc/system_wrappers/include/trace.h"
 #include "webrtc/voice_engine/transmit_mixer.h"
 
 namespace cricket {
 namespace {
 
-constexpr size_t kMaxUnsignaledRecvStreams = 50;
+constexpr size_t kMaxUnsignaledRecvStreams = 1;
 
 const int kDefaultTraceFilter = webrtc::kTraceNone | webrtc::kTraceTerseInfo |
                                 webrtc::kTraceWarning | webrtc::kTraceError |
                                 webrtc::kTraceCritical;
 const int kElevatedTraceFilter = kDefaultTraceFilter | webrtc::kTraceStateInfo |
                                  webrtc::kTraceInfo;
 
 // On Windows Vista and newer, Microsoft introduced the concept of "Default
 // Communications Device". This means that there are two types of default
 // devices (old Wave Audio style default and Default Communications Device).
@@ skipping 2632 matching lines @@
                       ssrc);
   if (it != unsignaled_recv_ssrcs_.end()) {
     unsignaled_recv_ssrcs_.erase(it);
     return true;
   }
   return false;
 }
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VOICE