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

chrome/browser/prerender/prerender_manager.h

Index: chrome/browser/prerender/prerender_manager.h
diff --git a/chrome/browser/prerender/prerender_manager.h b/chrome/browser/prerender/prerender_manager.h
index 516cffe56c1741f92307b9736ac0b782ab762229..0a37d62d58687246ab3f18527b10fe87980e6877 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -126,13 +126,10 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
 
   // For a given WebContents that wants to navigate to the URL supplied,
   // determines whether a prerendered version of the URL can be used,
-  // and substitutes the prerendered RVH into the WebContents. |opener_url| is
-  // set to the window.opener url that the WebContents should have set and
-  // will be empty if there is no opener set. Returns whether or not a
-  // prerendered RVH could be used or not.
+  // and substitutes the prerendered RVH into the WebContents. If a prerendered
+  // page can't be swapped in, NULL is returned.

[dominich, 2012/02/28 16:21:00]

NULL -> false

   bool MaybeUsePrerenderedPage(content::WebContents* web_contents,
-                               const GURL& url,
-                               const GURL& opener_url);
+                               const GURL& url);
 
   // Moves a PrerenderContents to the pending delete list from the list of
   // active prerenders when prerendering should be cancelled.