Fix bug with transient pages where they would stay alive permanently due to a

chrome/browser/extensions/extension_process_manager.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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/extension_host.h"
@@ skipping 436 matching lines @@
 void ExtensionProcessManager::OnUnloadAck(const std::string& extension_id) {
   ExtensionHost* host = GetBackgroundHostForExtension(extension_id);
   if (host)
     CloseBackgroundHost(host);
 }
 
 void ExtensionProcessManager::OnNetworkRequestStarted(
     RenderViewHost* render_view_host) {
   ExtensionHost* host = GetBackgroundHostForExtension(
       GetExtensionID(render_view_host));
-  if (host)
+  if (host && host->render_view_host() == render_view_host)
     IncrementLazyKeepaliveCount(host->extension());
 }
 
 void ExtensionProcessManager::OnNetworkRequestDone(
     RenderViewHost* render_view_host) {
   ExtensionHost* host = GetBackgroundHostForExtension(
       GetExtensionID(render_view_host));
-  if (host)
+  if (host && host->render_view_host() == render_view_host)
     DecrementLazyKeepaliveCount(host->extension());
 }
 
 void ExtensionProcessManager::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_EXTENSIONS_READY: {
       CreateBackgroundHostsForProfileStartup(this,
@@ skipping 209 matching lines @@
         if (service && service->is_ready())
           CreateBackgroundHostsForProfileStartup(this, service->extensions());
       }
       break;
     }
     default:
       ExtensionProcessManager::Observe(type, source, details);
       break;
   }
 }