Remove magic iframe load transfer support.

content/browser/renderer_host/resource_request_info_impl.h

Index: content/browser/renderer_host/resource_request_info_impl.h
diff --git a/content/browser/renderer_host/resource_request_info_impl.h b/content/browser/renderer_host/resource_request_info_impl.h
index b131c9428f4164a303ae0ced437e3a00445f91c1..95f50b372552f3239b0c25e67cee44875b19cdc7 100644
--- a/content/browser/renderer_host/resource_request_info_impl.h
+++ b/content/browser/renderer_host/resource_request_info_impl.h
@@ -120,10 +120,6 @@ class ResourceRequestInfoImpl : public ResourceRequestInfo,
     return process_type_;
   }
 
-  // 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; }
-
   // Number of messages we've sent to the renderer that we haven't gotten an
   // ACK for. This allows us to avoid having too many messages in flight.
   int pending_data_count() const { return pending_data_count_; }