Revert 90359 - Helper functions for tracking stale TabContentsDelegate's.

content/browser/tab_contents/tab_contents.cc

Index: content/browser/tab_contents/tab_contents.cc
===================================================================
--- content/browser/tab_contents/tab_contents.cc	(revision 90360)
+++ content/browser/tab_contents/tab_contents.cc	(working copy)
@@ -253,21 +253,8 @@
   FOR_EACH_OBSERVER(TabContentsObserver, observers_, TabContentsDestroyed());
 
   net::NetworkChangeNotifier::RemoveOnlineStateObserver(this);
-
-  set_delegate(NULL);
 }
 
-// TODO(cbentzel): Either remove the debugging code, or rename to SetDelegate.
-void TabContents::set_delegate(TabContentsDelegate* delegate) {
-  if (delegate == delegate_)
-    return;
-  if (delegate_)
-    delegate_->Detach(this);
-  delegate_ = delegate;
-  if (delegate_)
-    delegate_->Attach(this);
-}
-
 void TabContents::AddObservers() {
   net::NetworkChangeNotifier::AddOnlineStateObserver(this);
 }