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

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h
===================================================================
--- chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h	(revision 245386)
+++ chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h	(working copy)
@@ -52,13 +52,6 @@
       int child_id,
       int route_id,
       ScopedVector<content::ResourceThrottle>* throttles) OVERRIDE;
-   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) OVERRIDE;
   virtual void DownloadStarting(
       net::URLRequest* request,
       content::ResourceContext* resource_context,