[sysmgr] Re-add LegacySocketProvider to services map

This entry is needed by the prebuilt version of Chromium.

Test: WebRunnerSmokeTest
Change-Id: I5bcd2c5c16fb742c9a4e1bd5e4ef78a371c8845a
diff --git a/bin/sysmgr/config/services.config b/bin/sysmgr/config/services.config
index c9a1c4d..f5524cf 100644
--- a/bin/sysmgr/config/services.config
+++ b/bin/sysmgr/config/services.config
@@ -26,6 +26,7 @@
     "fuchsia.media.AudioDeviceEnumerator": "fuchsia-pkg://fuchsia.com/audio_core#meta/audio_core.cmx",
     "fuchsia.mediacodec.CodecFactory": "fuchsia-pkg://fuchsia.com/codec_factory#meta/codec_factory.cmx",
     "fuchsia.mediaplayer.Player": "fuchsia-pkg://fuchsia.com/mediaplayer#meta/mediaplayer.cmx",
+    "fuchsia.net.LegacySocketProvider": "fuchsia-pkg://fuchsia.com/netstack#meta/netstack.cmx",
     "fuchsia.net.SocketProvider": "fuchsia-pkg://fuchsia.com/netstack#meta/netstack.cmx",
     "fuchsia.net.oldhttp.HttpService": "fuchsia-pkg://fuchsia.com/http#meta/http.cmx",
     "fuchsia.netstack.Netstack": "fuchsia-pkg://fuchsia.com/netstack#meta/netstack.cmx",