Revert 258831 "Revert 258727 "Implement ServiceWorker::postMessage()""

content/child/webmessageportchannel_impl.h

Index: content/child/webmessageportchannel_impl.h
diff --git a/content/child/webmessageportchannel_impl.h b/content/child/webmessageportchannel_impl.h
index e737fc31fe3976b0076eed07def99a3ab2dd5e03..1fe46e8faa3317980a88a269eae24a4625a89900 100644
--- a/content/child/webmessageportchannel_impl.h
+++ b/content/child/webmessageportchannel_impl.h
@@ -33,6 +33,11 @@ class WebMessagePortChannelImpl
                             int message_port_id,
                             base::MessageLoopProxy* child_thread_loop);
 
+  // Extracts port IDs for passing on to the browser process, and queues any
+  // received messages. Takes ownership of the passed array (and deletes it).
+  static std::vector<int> ExtractMessagePortIDs(
+      blink::WebMessagePortChannelArray* channels);
+
   // Queues received and incoming messages until there are no more in-flight
   // messages, then sends all of them to the browser process.
   void QueueMessages();