diff --git a/media/engine/webrtc_voice_engine.cc b/media/engine/webrtc_voice_engine.cc
index f055a0000a..e8d4435611 100644
--- a/media/engine/webrtc_voice_engine.cc
+++ b/media/engine/webrtc_voice_engine.cc
@@ -1105,9 +1105,10 @@ class WebRtcVoiceSendChannel::WebRtcAudioSendStream : public AudioSource::Sink {
     RTC_DCHECK_RUN_ON(&worker_thread_checker_);
     RTC_DCHECK(stream_);
     RTC_DCHECK_EQ(1UL, rtp_parameters_.encodings.size());
-    if (send_ && source_ != nullptr && rtp_parameters_.encodings[0].active) {
+    // Stream can be started without |source_| being set.
+    if (send_ && rtp_parameters_.encodings[0].active) {
       stream_->Start();
-    } else {  // !send || source_ = nullptr
+    } else {
       stream_->Stop();
     }
   }
diff --git a/media/engine/webrtc_voice_engine_unittest.cc b/media/engine/webrtc_voice_engine_unittest.cc
index e1d7805180..0a3c592d17 100644
--- a/media/engine/webrtc_voice_engine_unittest.cc
+++ b/media/engine/webrtc_voice_engine_unittest.cc
@@ -2248,20 +2248,6 @@ TEST_P(WebRtcVoiceEngineTestFake, Send) {
   EXPECT_FALSE(GetSendStream(kSsrcX).IsSending());
 }
 
-// Test that a channel will send if and only if it has a source and is enabled
-// for sending.
-TEST_P(WebRtcVoiceEngineTestFake, SendStateWithAndWithoutSource) {
-  EXPECT_TRUE(SetupSendStream());
-  SetSenderParameters(send_parameters_);
-  SetAudioSend(kSsrcX, true, nullptr);
-  SetSend(true);
-  EXPECT_FALSE(GetSendStream(kSsrcX).IsSending());
-  SetAudioSend(kSsrcX, true, &fake_source_);
-  EXPECT_TRUE(GetSendStream(kSsrcX).IsSending());
-  SetAudioSend(kSsrcX, true, nullptr);
-  EXPECT_FALSE(GetSendStream(kSsrcX).IsSending());
-}
-
 // Test that a channel is muted/unmuted.
 TEST_P(WebRtcVoiceEngineTestFake, SendStateMuteUnmute) {
   EXPECT_TRUE(SetupSendStream());