Add SwappedOut to TabContentsDelegate to allow us to correctly delete TabContents.

content/browser/tab_contents/tab_contents.h

Index: content/browser/tab_contents/tab_contents.h
diff --git a/content/browser/tab_contents/tab_contents.h b/content/browser/tab_contents/tab_contents.h
index 7db1b49212d69ae75df8460d1ef6f3acabbcde8c..7df191cb8331e515e902aadfbfdd7a782b75908d 100644
--- a/content/browser/tab_contents/tab_contents.h
+++ b/content/browser/tab_contents/tab_contents.h
@@ -644,6 +644,7 @@ class CONTENT_EXPORT TabContents : public PageNavigator,
                               const std::string& encoding) OVERRIDE;
   virtual void UpdateTargetURL(int32 page_id, const GURL& url) OVERRIDE;
   virtual void Close(RenderViewHost* render_view_host) OVERRIDE;
+  virtual void SwappedOut(RenderViewHost* render_view_host) OVERRIDE;
   virtual void RequestMove(const gfx::Rect& new_bounds) OVERRIDE;
   virtual void DidStartLoading() OVERRIDE;
   virtual void DidStopLoading() OVERRIDE;