content: convert child process notifications to observer usage

content/browser/plugin_process_host.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/plugin_process_host.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_POSIX)
 #include <utility>  // for pair<>
@@ skipping 324 matching lines @@
       if (host->pending_requests_[i]->GetResourceContext() == context) {
         host->pending_requests_[i]->OnError();
         host->pending_requests_.erase(host->pending_requests_.begin() + i);
         --i;
       }
     }
   }
 }
 
 void PluginProcessHost::OpenChannelToPlugin(Client* client) {
-  process_->Notify(NOTIFICATION_CHILD_INSTANCE_CREATED);
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&BrowserChildProcessHostImpl::NotifyProcessInstanceCreated,
+                 process_->GetData()));
   client->SetPluginInfo(info_);
   if (process_->GetHost()->IsChannelOpening()) {
     // The channel is already in the process of being opened.  Put
     // this "open channel" request into a queue of requests that will
     // be run once the channel is open.
     pending_requests_.push_back(client);
     return;
   }
 
   // We already have an open channel, send a request right away to plugin.
@@ skipping 46 matching lines @@
 void PluginProcessHost::OnChannelCreated(
     const IPC::ChannelHandle& channel_handle) {
   Client* client = sent_requests_.front();
 
   if (client)
     client->OnChannelOpened(channel_handle);
   sent_requests_.pop_front();
 }
 
 }  // namespace content