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

chrome/browser/renderer_host/browser_render_process_host.cc

Index: chrome/browser/renderer_host/browser_render_process_host.cc
===================================================================
--- chrome/browser/renderer_host/browser_render_process_host.cc	(revision 18701)
+++ chrome/browser/renderer_host/browser_render_process_host.cc	(working copy)
@@ -641,6 +641,8 @@
                           OnExtensionAddListener)
       IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionRemoveListener,
                           OnExtensionRemoveListener)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionCloseChannel,
+                          OnExtensionCloseChannel)
       IPC_MESSAGE_UNHANDLED_ERROR()
     IPC_END_MESSAGE_MAP_EX()
 
@@ -857,14 +859,17 @@
 
 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);
+}