Remove PrerenderResourceThrottle and related infrastructure.

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 97648b0fff8f256623fd0a5bedc06a1d028b9b9b..3825abf0817e0018c93c75b6177d51bb0bd9b1b0 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -699,18 +699,6 @@ bool PrerenderManager::WouldWebContentsBePrerendered(
   return would_be_prerendered_tab_contents_set_.count(web_contents) > 0;
 }
 
-bool PrerenderManager::IsOldRenderViewHost(
-    const RenderViewHost* render_view_host) const {
-  for (std::list<TabContentsWrapper*>::const_iterator it =
-           old_tab_contents_list_.begin();
-       it != old_tab_contents_list_.end();
-       ++it) {
-    if ((*it)->web_contents()->GetRenderViewHost() == render_view_host)
-      return true;
-  }
-  return false;
-}
-
 bool PrerenderManager::HasRecentlyBeenNavigatedTo(const GURL& url) {
   DCHECK(CalledOnValidThread());