Return a copy of the supported RTP header extensions instead of a reference.

talk/media/webrtc/webrtcvoiceengine_unittest.cc

 /*
  * libjingle
  * Copyright 2008 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 3091 matching lines @@
 
   // Combined BWE should be set up, but with no configured extensions.
   EXPECT_EQ(2, call_.GetAudioReceiveStreams().size());
   for (uint32_t ssrc : ssrcs) {
     const auto* s = call_.GetAudioReceiveStream(ssrc);
     EXPECT_NE(nullptr, s);
     EXPECT_EQ(0, s->GetConfig().rtp.extensions.size());
   }
 
   // Set up receive extensions.
-  const auto& e_exts = engine_.rtp_header_extensions();
+  cricket::RtpCapabilities capabilities = engine_.GetCapabilities();
   cricket::AudioRecvParameters recv_parameters;
-  recv_parameters.extensions = e_exts;
+  recv_parameters.extensions = capabilities.header_extensions;
   channel_->SetRecvParameters(recv_parameters);
   EXPECT_EQ(2, call_.GetAudioReceiveStreams().size());
   for (uint32_t ssrc : ssrcs) {
     const auto* s = call_.GetAudioReceiveStream(ssrc);
     EXPECT_NE(nullptr, s);
     const auto& s_exts = s->GetConfig().rtp.extensions;
-    EXPECT_EQ(e_exts.size(), s_exts.size());
-    for (const auto& e_ext : e_exts) {
+    EXPECT_EQ(capabilities.header_extensions.size(), s_exts.size());
+    for (const auto& e_ext : capabilities.header_extensions) {
       for (const auto& s_ext : s_exts) {
         if (e_ext.id == s_ext.id) {
           EXPECT_EQ(e_ext.uri, s_ext.name);
         }
       }
     }
   }
 
   // Disable receive extensions.
   channel_->SetRecvParameters(cricket::AudioRecvParameters());
@@ skipping 219 matching lines @@
   cricket::WebRtcVoiceEngine engine;
   EXPECT_TRUE(engine.Init(rtc::Thread::Current()));
   rtc::scoped_ptr<webrtc::Call> call(
       webrtc::Call::Create(webrtc::Call::Config()));
   cricket::WebRtcVoiceMediaChannel channel(&engine, cricket::AudioOptions(),
                                            call.get());
   cricket::AudioRecvParameters parameters;
   parameters.codecs = engine.codecs();
   EXPECT_TRUE(channel.SetRecvParameters(parameters));
 }