Revert of [NoStatePrefetch] Kill renderer after preload scanning

chrome/browser/prerender/prerender_message_filter.h

Index: chrome/browser/prerender/prerender_message_filter.h
diff --git a/chrome/browser/prerender/prerender_message_filter.h b/chrome/browser/prerender/prerender_message_filter.h
index 33b56bd4fcd4278828729fa3fdbecd0bc4a7bcdb..f3695a4ed9bdd24f1eb2ce3013eebead35634db5 100644
--- a/chrome/browser/prerender/prerender_message_filter.h
+++ b/chrome/browser/prerender/prerender_message_filter.h
@@ -4,8 +4,6 @@
 
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_MESSAGE_FILTER_H_
-
-#include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
@@ -31,7 +29,6 @@
 namespace prerender {
 
 class PrerenderLinkManager;
-class PrerenderManager;
 
 class PrerenderMessageFilter : public content::BrowserMessageFilter {
  public:
@@ -60,13 +57,10 @@
                       int render_view_route_id);
   void OnCancelPrerender(int prerender_id);
   void OnAbandonPrerender(int prerender_id);
-  void OnPrefetchFinished();
 
   void ShutdownOnUIThread();
 
   void OnChannelClosingInUIThread();
-
-  PrerenderManager* prerender_manager_;
 
   const int render_process_id_;