Send port disconnect events when a frame is unloaded.

chrome/browser/renderer_host/browser_render_process_host.cc

Index: chrome/browser/renderer_host/browser_render_process_host.cc
diff --git a/chrome/browser/renderer_host/browser_render_process_host.cc b/chrome/browser/renderer_host/browser_render_process_host.cc
index 03c961aab7eb861b1197ae06648c923565484fe6..a462862f73d6f0b947d22f54c2dc3cb8b69433be 100644
--- a/chrome/browser/renderer_host/browser_render_process_host.cc
+++ b/chrome/browser/renderer_host/browser_render_process_host.cc
@@ -671,6 +671,8 @@ void BrowserRenderProcessHost::OnMessageReceived(const IPC::Message& msg) {
                           OnExtensionAddListener)
       IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionRemoveListener,
                           OnExtensionRemoveListener)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionCloseChannel,
+                          OnExtensionCloseChannel)
       IPC_MESSAGE_UNHANDLED_ERROR()
     IPC_END_MESSAGE_MAP_EX()
 
@@ -887,14 +889,17 @@ void BrowserRenderProcessHost::Observe(NotificationType type,
 
 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);
 }