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

chrome/browser/extensions/extension_process_manager.cc

Index: chrome/browser/extensions/extension_process_manager.cc
diff --git a/chrome/browser/extensions/extension_process_manager.cc b/chrome/browser/extensions/extension_process_manager.cc
index c623599d2d5e539ac5cd76c6ef70bc8fc40db9d8..2cd0d67fcbf5d0162a46d8ee5c41bd2d469b8e0f 100644
--- a/chrome/browser/extensions/extension_process_manager.cc
+++ b/chrome/browser/extensions/extension_process_manager.cc
@@ -454,7 +454,7 @@ 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());
 }
 
@@ -462,7 +462,7 @@ 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());
 }