Step two of optionally sending messages to/from message ports as base::Value.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 4002 matching lines @@
       }
     } else {
       // We couldn't find it, so don't pass a source frame.
       new_params.source_routing_id = MSG_ROUTING_NONE;
     }
   }
 
   // In most cases, we receive this from a swapped out RenderViewHost.
   // It is possible to receive it from one that has just been swapped in,
   // in which case we might as well deliver the message anyway.
-  if (!params.message_port_ids.empty()) {
+  if (!params.message_ports.empty()) {
     // Updating the message port information has to be done in the IO thread;
     // MessagePortMessageFilter::RouteMessageEventWithMessagePorts will send
     // ViewMsg_PostMessageEvent after it's done. Note that a trivial solution
     // would've been to post a task on the IO thread to do the IO-thread-bound
     // work, and make that post a task back to WebContentsImpl in the UI
     // thread. But we cannot do that, since there's nothing to guarantee that
     // WebContentsImpl stays alive during the round trip.
     scoped_refptr<MessagePortMessageFilter> message_port_message_filter(
         static_cast<RenderProcessHostImpl*>(GetRenderProcessHost())
         ->message_port_message_filter());
@@ skipping 482 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content