Revert of [NoStatePrefetch] Kill renderer after preload scanning

chrome/common/prerender_messages.h

Index: chrome/common/prerender_messages.h
diff --git a/chrome/common/prerender_messages.h b/chrome/common/prerender_messages.h
index 3c4d5311f90eab3510b88b34473c374e8d00eca8..43066a717dbb515a0205c6bb6949fd2ea302fcc2 100644
--- a/chrome/common/prerender_messages.h
+++ b/chrome/common/prerender_messages.h
@@ -46,10 +46,6 @@
 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.