Helper functions for tracking stale TabContentsDelegate's.

content/browser/tab_contents/tab_contents.cc

Index: content/browser/tab_contents/tab_contents.cc
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index 200d80fea880fb8ec3412cec32a72e2bf35f88ce..c167bfe8c152b7ef61bfd70e28043664944658ee 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -254,6 +254,19 @@ TabContents::~TabContents() {
   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() {