Cancel prerenders that spawn post requests.

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 2b80186a016af74f55beef070ac690160af1de9f..e12dead1031180caa82144c3b46d4acb1ace5216 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -147,6 +147,18 @@ void HandlePrefetchTagOnUIThread(
     prerender_manager->AddPreload(child_route_id_pair, url, referrer);
 }
 
+void DestroyPreloadForChildRouteIdPairOnUIThread(
+    const base::WeakPtr<PrerenderManager>& prerender_manager_weak_ptr,
+    const std::pair<int, int>& child_route_id_pair,
+    FinalStatus final_status) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  PrerenderManager* prerender_manager = prerender_manager_weak_ptr.get();
+  if (!prerender_manager || !prerender_manager->is_enabled())
+    return;
+  prerender_manager->DestroyPreloadForChildRouteIdPair(child_route_id_pair,
+                                                       final_status);
+}
+
 PrerenderManager::PrerenderManager(Profile* profile)
     : rate_limit_enabled_(true),
       enabled_(true),
@@ -306,6 +318,33 @@ void PrerenderManager::AddPendingPreload(
   it->second.push_back(PendingContentsData(url, referrer));
 }
 
+void PrerenderManager::DestroyPreloadForChildRouteIdPair(
+    const std::pair<int, int>& child_route_id_pair,
+    FinalStatus final_status) {
+  DCHECK(CalledOnValidThread());
+  for (std::list<PrerenderContentsData>::iterator it = prerender_list_.begin();
+       it != prerender_list_.end();) {
+    PrerenderContents* prerender_contents = it->contents_;
+
+    int child_id;
+    int route_id;
+    bool has_child_id = prerender_contents->GetChildId(&child_id);
+    bool has_route_id = has_child_id &&
+                        prerender_contents->GetRouteId(&route_id);
+
+    if (has_child_id && has_route_id &&
+        child_id == child_route_id_pair.first &&
+        route_id == child_route_id_pair.second) {
+      prerender_contents->set_final_status(final_status);
+      RemovePendingPreload(prerender_contents);
+      delete prerender_contents;
+      it = prerender_list_.erase(it);
+    } else {
+      ++it;
+    }
+  }
+}
+
 void PrerenderManager::DeleteOldEntries() {
   DCHECK(CalledOnValidThread());
   while (!prerender_list_.empty()) {