Remove the use of ProvisionalChangeToMainFrameUrl from prerender code.

chrome/browser/prerender/prerender_tab_helper.h

Index: chrome/browser/prerender/prerender_tab_helper.h
diff --git a/chrome/browser/prerender/prerender_tab_helper.h b/chrome/browser/prerender/prerender_tab_helper.h
index 260091dd219f15a2054ce5c2327f5628302fcda8..f0a2d34c88af98f14d8f041cbf7e0085c64c8988 100644
--- a/chrome/browser/prerender/prerender_tab_helper.h
+++ b/chrome/browser/prerender/prerender_tab_helper.h
@@ -51,9 +51,9 @@ class PrerenderTabHelper
   virtual ~PrerenderTabHelper();
 
   // content::WebContentsObserver implementation.
-  virtual void ProvisionalChangeToMainFrameUrl(
-      const GURL& url,
-      content::RenderFrameHost* render_frame_host) OVERRIDE;
+  virtual void DidGetRedirectForResourceRequest(
+      content::RenderViewHost* render_view_host,
+      const content::ResourceRedirectDetails& details) OVERRIDE;
   virtual void DidStopLoading(
       content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidStartProvisionalLoadForFrame(
@@ -66,6 +66,10 @@ class PrerenderTabHelper
       const GURL& validated_url,
       content::PageTransition transition_type) OVERRIDE;
 
+  // Called when the URL of the main frame changed, either when the load
+  // commits, or a redirect happens.
+  void MainFrameUrlDidChange(const GURL& url);
+
   // Called when a password form has been submitted.
   void PasswordSubmitted(const autofill::PasswordForm& form);