Makes instant run before unload listeners.

chrome/browser/tabs/tab_strip_model.h

Index: chrome/browser/tabs/tab_strip_model.h
diff --git a/chrome/browser/tabs/tab_strip_model.h b/chrome/browser/tabs/tab_strip_model.h
index 2aae16e905d6860a6b7cd2e053d6f80e464268cc..7a3c8d912d160a75842745697185465c26de58cc 100644
--- a/chrome/browser/tabs/tab_strip_model.h
+++ b/chrome/browser/tabs/tab_strip_model.h
@@ -195,9 +195,11 @@ class TabStripModel : public NotificationObserver {
   void ReplaceNavigationControllerAt(int index,
                                      TabContentsWrapper* contents);
 
-  // Replaces the tab contents at |index| with |new_contents|. This deletes the
-  // TabContents currently at |index|.
-  void ReplaceTabContentsAt(int index, TabContentsWrapper* new_contents);
+  // Replaces the tab contents at |index| with |new_contents|. The
+  // TabContentsWrapper that was at |index| is returned and ownership returns
+  // to the caller.
+  TabContentsWrapper* ReplaceTabContentsAt(int index,
+                                           TabContentsWrapper* new_contents);
 
   // Detaches the TabContents at the specified index from this strip. The
   // TabContents is not destroyed, just removed from display. The caller is