Convert PrerenderContents to use the new navigation callbacks.

content/browser/frame_host/navigation_handle_impl.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_
 
 #include "content/public/browser/navigation_handle.h"
 
 #include <stddef.h>
@@ skipping 79 matching lines @@
       bool started_from_context_menu);
   ~NavigationHandleImpl() override;
 
   // NavigationHandle implementation:
   const GURL& GetURL() override;
   SiteInstance* GetStartingSiteInstance() override;
   bool IsInMainFrame() override;
   bool IsParentMainFrame() override;
   bool IsRendererInitiated() override;
   bool WasServerRedirect() override;
+  const std::vector<GURL>& GetRedirectChain() override;
   int GetFrameTreeNodeId() override;
   int GetParentFrameTreeNodeId() override;
   const base::TimeTicks& NavigationStart() override;
   bool IsPost() override;
   const Referrer& GetReferrer() override;
   bool HasUserGesture() override;
   ui::PageTransition GetPageTransition() override;
   bool IsExternalProtocol() override;
   net::Error GetNetErrorCode() override;
   RenderFrameHostImpl* GetRenderFrameHost() override;
@@ skipping 348 matching lines @@
   std::string searchable_form_encoding_;
 
   base::WeakPtrFactory<NavigationHandleImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationHandleImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_