Send port-closed notification when a frame with ports unloads....

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2006-2009 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include "build/build_config.h"
@@ skipping 623 matching lines @@
     IPC_BEGIN_MESSAGE_MAP_EX(BrowserRenderProcessHost, msg, msg_is_ok)
       IPC_MESSAGE_HANDLER(ViewHostMsg_PageContents, OnPageContents)
       IPC_MESSAGE_HANDLER(ViewHostMsg_UpdatedCacheStats,
                           OnUpdatedCacheStats)
       IPC_MESSAGE_HANDLER(ViewHostMsg_SuddenTerminationChanged,
                           SuddenTerminationChanged);
       IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionAddListener,
                           OnExtensionAddListener)
       IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionRemoveListener,
                           OnExtensionRemoveListener)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionCloseChannel,
+                          OnExtensionCloseChannel)
       IPC_MESSAGE_UNHANDLED_ERROR()
     IPC_END_MESSAGE_MAP_EX()
 
     if (!msg_is_ok) {
       // The message had a handler, but its de-serialization failed.
       // We consider this a capital crime. Kill the renderer if we have one.
       ReceivedBadMessage(msg.type());
     }
     return;
   }
@@ skipping 196 matching lines @@
     }
     default: {
       NOTREACHED();
       break;
     }
   }
 }
 
 void BrowserRenderProcessHost::OnExtensionAddListener(
     const std::string& event_name) {
-  URLRequestContext* context = profile()->GetRequestContext();
-  ExtensionMessageService* ems = ExtensionMessageService::GetInstance(context);
-  ems->AddEventListener(event_name, pid());
+  ExtensionMessageService::GetInstance(profile()->GetRequestContext())->
+      AddEventListener(event_name, pid());
 }
 
 void BrowserRenderProcessHost::OnExtensionRemoveListener(
     const std::string& event_name) {
-  URLRequestContext* context = profile()->GetRequestContext();
-  ExtensionMessageService* ems = ExtensionMessageService::GetInstance(context);
-  ems->RemoveEventListener(event_name, pid());
+  ExtensionMessageService::GetInstance(profile()->GetRequestContext())->
+      RemoveEventListener(event_name, pid());
 }
+
+void BrowserRenderProcessHost::OnExtensionCloseChannel(int port_id) {
+  ExtensionMessageService::GetInstance(profile()->GetRequestContext())->
+      CloseChannel(port_id);
+}