Delete TODO-comment about guest process/frame IDs in MessageService::OpenChannelImpl

chrome/browser/extensions/api/messaging/message_service.cc

Index: chrome/browser/extensions/api/messaging/message_service.cc
diff --git a/chrome/browser/extensions/api/messaging/message_service.cc b/chrome/browser/extensions/api/messaging/message_service.cc
index 5b4c3829bff7839f33c2214405d12a301177a635..30fcd588e0015dace17f646ccfcca8889f10f832 100644
--- a/chrome/browser/extensions/api/messaging/message_service.cc
+++ b/chrome/browser/extensions/api/messaging/message_service.cc
@@ -594,11 +594,6 @@ void MessageService::OpenChannelImpl(BrowserContext* browser_context,
   channel->receiver.reset(params->receiver.release());
   AddChannel(std::move(channel_ptr), params->receiver_port_id);
 
-  // TODO(robwu): Could |guest_process_id| and |guest_render_frame_routing_id|
-  // be removed? In the past extension message routing was process-based, but
-  // now that extensions are routed from a specific RFH, the special casing for
-  // guest views seems no longer necessary, because the ExtensionMessagePort can
-  // simply obtain the source process & frame ID directly from the RFH.
   int guest_process_id = content::ChildProcessHost::kInvalidUniqueID;
   int guest_render_frame_routing_id = MSG_ROUTING_NONE;
   if (params->include_guest_process_info) {