Revert of [NoStatePrefetch] Kill renderer after preload scanning

chrome/common/prerender_messages.h

 // Copyright (c) 2012 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.
 
 // Multiply-included message file, no traditional include guard.
 
 #include <stdint.h>
 
 #include "chrome/common/prerender_types.h"
 #include "content/public/common/referrer.h"
@@ skipping 28 matching lines @@
                      int /* render_view_route_id of launcher */)
 
 // Notifies on removal of a <link rel=prerender> element from the document.
 IPC_MESSAGE_CONTROL1(PrerenderHostMsg_CancelLinkRelPrerender,
                      int /* prerender_id, assigned by WebPrerendererClient */)
 
 // Notifies on unloading a <link rel=prerender> element from a frame.
 IPC_MESSAGE_CONTROL1(PrerenderHostMsg_AbandonLinkRelPrerender,
                      int /* prerender_id, assigned by WebPrerendererClient */)
 
-// Sent by the renderer process to notify that the resource prefetcher has
-// discovered all possible subresources and issued requests for them.
-IPC_MESSAGE_CONTROL0(PrerenderHostMsg_PrefetchFinished)
-
 // PrerenderDispatcher Messages
 // These are messages sent from the browser to the renderer in relation to
 // running prerenders.
 
 // Tells a renderer if it's currently being prerendered.  Must only be set
 // before any navigation occurs, and only set to NO_PRERENDER at most once after
 // that.
 IPC_MESSAGE_ROUTED1(PrerenderMsg_SetIsPrerendering, prerender::PrerenderMode)
 
 // Signals to launcher that a prerender is running.
@@ skipping 12 matching lines @@
 IPC_MESSAGE_CONTROL1(PrerenderMsg_OnPrerenderAddAlias,
                      GURL /* url */)
 
 // Signals to a launcher that a new alias has been added to a prerender.
 IPC_MESSAGE_CONTROL1(PrerenderMsg_OnPrerenderRemoveAliases,
                      std::vector<GURL> /* urls */)
 
 // Signals to a launcher that a prerender is no longer running.
 IPC_MESSAGE_CONTROL1(PrerenderMsg_OnPrerenderStop,
                      int /* prerender_id */)