Revert of [NoStatePrefetch] Kill renderer after preload scanning

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 54bde4d882822ce3812a8fb8a6b1587fa649ffb9..0d4407770d36e8cb2d26bc977d55f3d0e9abd934 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -268,11 +268,6 @@
   virtual PrerenderContents* GetPrerenderContentsForRoute(
       int child_id, int route_id) const;
 
-  // Returns the PrerenderContents object that is found in active prerenders to
-  // match the |render_process_id|. Otherwise returns a nullptr.
-  PrerenderContents* GetPrerenderContentsForProcess(
-      int render_process_id) const;
-
   // Returns a list of all WebContents being prerendered.
   std::vector<content::WebContents*> GetAllPrerenderingContents() const;