Reland 97048 - Update routing id of pending resource requests for reparented iframes.

content/browser/renderer_host/resource_dispatcher_host_request_info.h

Index: content/browser/renderer_host/resource_dispatcher_host_request_info.h
===================================================================
--- content/browser/renderer_host/resource_dispatcher_host_request_info.h	(revision 97077)
+++ content/browser/renderer_host/resource_dispatcher_host_request_info.h	(working copy)
@@ -91,6 +91,10 @@
   // or like-thing in the renderer that the request gets routed to).
   int route_id() const { return route_id_; }
 
+  // The route_id of pending request can change when it is transferred to a new
+  // page (as in iframe transfer using adoptNode JS API).
+  void set_route_id(int route_id) { route_id_ = route_id; }
+
   // The pid of the originating process, if the request is sent on behalf of a
   // another process.  Otherwise it is 0.
   int origin_pid() const { return origin_pid_; }