Fix a crash when receiving PAUSE action but no service is routed

content/browser/media/session/media_session_impl_service_routing_unittest.cc

Index: content/browser/media/session/media_session_impl_service_routing_unittest.cc
diff --git a/content/browser/media/session/media_session_impl_service_routing_unittest.cc b/content/browser/media/session/media_session_impl_service_routing_unittest.cc
index ff969be22f82f8a2087d93a39661b1d92d4cf39f..2aa4d8443d86a13a37a4f4809726c97e147fc487 100644
--- a/content/browser/media/session/media_session_impl_service_routing_unittest.cc
+++ b/content/browser/media/session/media_session_impl_service_routing_unittest.cc
@@ -402,4 +402,16 @@ TEST_F(MediaSessionImplServiceRoutingTest,
   run_loop.Run();
 }
 
+TEST_F(MediaSessionImplServiceRoutingTest,
+       TestReceivingPauseActionWhenNoServiceRouted) {
+  CreateServiceForFrame(main_frame_);
+  CreateServiceForFrame(sub_frame_);
+
+  EXPECT_EQ(nullptr, ComputeServiceForRouting());
+
+  // This should not crash.
+  MediaSessionImpl::Get(contents())
+      ->DidReceiveAction(blink::mojom::MediaSessionAction::PAUSE);
+}
+
 }  // namespace content