Remove magic iframe load transfer support.

content/common/resource_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for resource loading.
 
 // Multiply-included message file, hence no include guard.
 #include "base/shared_memory.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/resource_response.h"
@@ skipping 168 matching lines @@
 
 // Makes a resource request via the browser.
 IPC_MESSAGE_ROUTED2(ResourceHostMsg_RequestResource,
                     int /* request_id */,
                     ResourceHostMsg_Request)
 
 // Cancels a resource request with the ID given as the parameter.
 IPC_MESSAGE_ROUTED1(ResourceHostMsg_CancelRequest,
                     int /* request_id */)
 
-// Sets a new routing id for the resource request with the ID given as the
-// parameter. This happens when a pending request is transferred to another
-// page.
-IPC_MESSAGE_CONTROL2(ResourceHostMsg_TransferRequestToNewPage,
-                     int /* new routing_id */,
-                     int /* request_id */)
-
 // Follows a redirect that occured for the resource request with the ID given
 // as the parameter.
 IPC_MESSAGE_ROUTED3(ResourceHostMsg_FollowRedirect,
                     int /* request_id */,
                     bool /* has_new_first_party_for_cookies */,
                     GURL /* new_first_party_for_cookies */)
 
 // Makes a synchronous resource request via the browser.
 IPC_SYNC_MESSAGE_ROUTED2_1(ResourceHostMsg_SyncLoad,
                            int /* request_id */,
@@ skipping 10 matching lines @@
                     int /* request_id */)
 
 // Sent by the renderer process to acknowledge receipt of a
 // UploadProgress message.
 IPC_MESSAGE_ROUTED1(ResourceHostMsg_UploadProgress_ACK,
                     int /* request_id */)
 
 // Sent when the renderer process deletes a resource loader.
 IPC_MESSAGE_CONTROL1(ResourceHostMsg_ReleaseDownloadedFile,
                      int /* request_id */)