Makes instant run before unload listeners.

chrome/browser/tab_contents/tab_contents.h

Index: chrome/browser/tab_contents/tab_contents.h
diff --git a/chrome/browser/tab_contents/tab_contents.h b/chrome/browser/tab_contents/tab_contents.h
index e93ddeb7e68fdd229114afd2d0a6c617c2e8e834..3ac7aeecce05a517856ebadec5dd2d7502169b43 100644
--- a/chrome/browser/tab_contents/tab_contents.h
+++ b/chrome/browser/tab_contents/tab_contents.h
@@ -345,6 +345,11 @@ class TabContents : public PageNavigator,
   virtual void ShowContents();
   virtual void HideContents();
 
+  // Returns true if the before unload listener needs to be fired. The value of
+  // this changes over time. For example, if true and the before unload listener
+  // is executed and allows the user to exit, then this returns false.
+  bool NeedToFireBeforeUnload();
+
 #ifdef UNIT_TEST
   // Expose the render manager for testing.
   RenderViewHostManager* render_manager() { return &render_manager_; }