Cancel prerenders that spawn post requests.

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 356b33a9c7fea0b8184dff362f062a1f3edb53a5..2d23969098f87c7f1acd4a2c2499c1bda746c675 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -44,6 +44,11 @@ void HandlePrefetchTagOnUIThread(
     const GURL& referrer,
     bool make_pending);
 
+void DestroyPreloadForChildRouteIdPairOnUIThread(
+    const base::WeakPtr<PrerenderManager>& prerender_manager_weak_ptr,
+    const std::pair<int, int>& child_route_id_pair,
+    FinalStatus final_status);
+
 // PrerenderManager is responsible for initiating and keeping prerendered
 // views of webpages. All methods must be called on the UI thread unless
 // indicated otherwise.
@@ -78,6 +83,12 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
                          const GURL& url,
                          const GURL& referrer);
 
+  // Destroy all preloads for the given child route id pair and assign a final
+  // status to them.
+  void DestroyPreloadForChildRouteIdPair(
+      const std::pair<int, int>& child_route_id_pair,
+      FinalStatus final_status);
+
   // For a given TabContents that wants to navigate to the URL supplied,
   // determines whether a preloaded version of the URL can be used,
   // and substitutes the prerendered RVH into the TabContents.  Returns