Make PrerenderTracker's resource_throttle_io_thread_map_ use RenderFrame IDs instead of RenderView …

content/public/browser/resource_dispatcher_host_delegate.h

Index: content/public/browser/resource_dispatcher_host_delegate.h
===================================================================
--- content/public/browser/resource_dispatcher_host_delegate.h	(revision 245386)
+++ content/public/browser/resource_dispatcher_host_delegate.h	(working copy)
@@ -64,15 +64,6 @@
       int route_id,
       ScopedVector<ResourceThrottle>* throttles);
 
-  // Called if a navigation request is transferred from one process to another.
-  virtual void WillTransferRequestToNewProcess(
-      int old_child_id,
-      int old_route_id,
-      int old_request_id,
-      int new_child_id,
-      int new_route_id,
-      int new_request_id);
-
   // Allows an embedder to add additional resource handlers for a download.
   // |must_download| is set if the request must be handled as a download.
   virtual void DownloadStarting(