Do not kill renderer when enumerateDevices is called from about:blank.

content/browser/renderer_host/media/media_devices_dispatcher_host.cc

Index: content/browser/renderer_host/media/media_devices_dispatcher_host.cc
diff --git a/content/browser/renderer_host/media/media_devices_dispatcher_host.cc b/content/browser/renderer_host/media/media_devices_dispatcher_host.cc
index cea286fb55e71a06468c55f4d1fccdd8dd0aca44..28b09810240b4ea3344a235ed16dcdb747ff0dbf 100644
--- a/content/browser/renderer_host/media/media_devices_dispatcher_host.cc
+++ b/content/browser/renderer_host/media/media_devices_dispatcher_host.cc
@@ -117,6 +117,10 @@ void MediaDevicesDispatcherHost::EnumerateDevices(
     return;
   }
 
+  // Ignore requests from unique origins, but do not crash the renderer.
+  if (security_origin.unique())
+    return;
+
   if (!MediaStreamManager::IsOriginAllowed(render_process_id_,
                                            security_origin)) {
     bad_message::ReceivedBadMessage(render_process_id_,