Revert some old debugging code for tracking down a (now-closed) crash bug.

chrome/browser/extensions/extension_host.cc

Index: chrome/browser/extensions/extension_host.cc
diff --git a/chrome/browser/extensions/extension_host.cc b/chrome/browser/extensions/extension_host.cc
index 09d30b7a9c08f2b159abc079ee9da5341e4af114..290b93d48e46b7b9946fd317b208b1857e28bfa0 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -157,14 +157,6 @@ ExtensionHost::~ExtensionHost() {
       Details<ExtensionHost>(this));
   ProcessCreationQueue::get()->Remove(this);
   render_view_host_->Shutdown();  // deletes render_view_host
-
-  if (recently_deleted()->size() >= 20)
-    recently_deleted()->pop_front();
-  recently_deleted()->push_back(this);
-}
-
-ExtensionHost::HostPointerList* ExtensionHost::recently_deleted() {
-  return Singleton<HostPointerList>::get();
 }
 
 void ExtensionHost::CreateView(Browser* browser) {