Prerendered pages are swapped in at browser::Navigate time.

chrome/browser/ui/browser.h

Index: chrome/browser/ui/browser.h
diff --git a/chrome/browser/ui/browser.h b/chrome/browser/ui/browser.h
index edff49067b3713f4a9e39881045ed008dc5c0885..ecc04973e79ebb1471ab90084311a93c731dbf5d 100644
--- a/chrome/browser/ui/browser.h
+++ b/chrome/browser/ui/browser.h
@@ -765,6 +765,9 @@ class Browser : public TabHandlerDelegate,
   // Overridden from content::PageNavigator:
   virtual content::WebContents* OpenURL(
       const content::OpenURLParams& params) OVERRIDE;
+  virtual content::WebContents* OpenURLFromTab(
+      content::WebContents* source,
+      const content::OpenURLParams& params) OVERRIDE;
 
   // Overridden from CommandUpdater::CommandUpdaterDelegate:
   virtual void ExecuteCommand(int id) OVERRIDE;
@@ -920,9 +923,6 @@ class Browser : public TabHandlerDelegate,
   };
 
   // Overridden from content::WebContentsDelegate:
-  virtual content::WebContents* OpenURLFromTab(
-      content::WebContents* source,
-      const content::OpenURLParams& params) OVERRIDE;
   virtual void NavigationStateChanged(const content::WebContents* source,
                                       unsigned changed_flags) OVERRIDE;
   virtual void AddNewContents(content::WebContents* source,