Fix teardown of stale AudioStreamMonitor poll callbacks.

content/browser/media/audio_stream_monitor_unittest.cc

Index: content/browser/media/audio_stream_monitor_unittest.cc
diff --git a/content/browser/media/audio_stream_monitor_unittest.cc b/content/browser/media/audio_stream_monitor_unittest.cc
index f1d5103d1ce13849be5b3f307657020a445c0083..35d80540459d62c0686b398f83830e9693df7973 100644
--- a/content/browser/media/audio_stream_monitor_unittest.cc
+++ b/content/browser/media/audio_stream_monitor_unittest.cc
@@ -343,4 +343,16 @@ TEST_F(AudioStreamMonitorTest, MultipleRendererProcesses) {
   ExpectIsPolling(kAnotherRenderProcessId, kStreamId, false);
 }
 
+TEST_F(AudioStreamMonitorTest, RenderProcessGone) {
+  StartMonitoring(kRenderProcessId, kStreamId, CreatePollCallback(kStreamId));
+  StartMonitoring(kAnotherRenderProcessId, kStreamId,
+                  CreatePollCallback(kStreamId));
+  ExpectIsPolling(kRenderProcessId, kStreamId, true);
+  ExpectIsPolling(kAnotherRenderProcessId, kStreamId, true);
+  monitor_->RenderProcessGone(kRenderProcessId);
+  ExpectIsPolling(kRenderProcessId, kStreamId, false);
+  monitor_->RenderProcessGone(kAnotherRenderProcessId);
+  ExpectIsPolling(kAnotherRenderProcessId, kStreamId, false);
+}
+
 }  // namespace content