Helper functions for tracking stale TabContentsDelegate's.

content/browser/tab_contents/tab_contents_delegate.h

Index: content/browser/tab_contents/tab_contents_delegate.h
diff --git a/content/browser/tab_contents/tab_contents_delegate.h b/content/browser/tab_contents/tab_contents_delegate.h
index 0645128b9add09ea15037d25547eb3260f806efb..d41b00bd8a392f1f78150501885a8de0e95f9b96 100644
--- a/content/browser/tab_contents/tab_contents_delegate.h
+++ b/content/browser/tab_contents/tab_contents_delegate.h
@@ -6,6 +6,7 @@
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_
 #pragma once
 
+#include <set>
 #include <string>
 
 #include "base/basictypes.h"
@@ -50,6 +51,9 @@ class TabContentsDelegate {
     virtual ~MainFrameCommitDetails() {}
   };
 
+  void Attach(TabContents* source);
+  void Detach(TabContents* source);
+
   // Opens a new URL inside the passed in TabContents (if source is 0 open
   // in the current front-most tab), unless |disposition| indicates the url
   // should be opened in a new tab or window.
@@ -310,6 +314,9 @@ class TabContentsDelegate {
 
  protected:
   virtual ~TabContentsDelegate();
+
+ private:
+  std::set<TabContents*> attached_contents_;
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_