Preserving Content-Type header from http request in OpenURL path.

content/common/frame_messages.h

 // Copyright 2013 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 interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 392 matching lines @@
 IPC_STRUCT_TRAITS_END()
 
 // Parameters included with an OpenURL request.
 // |is_history_navigation_in_new_child| is true in the case that the browser
 // process should look for an existing history item for the frame.
 IPC_STRUCT_BEGIN(FrameHostMsg_OpenURL_Params)
   IPC_STRUCT_MEMBER(GURL, url)
   IPC_STRUCT_MEMBER(bool, uses_post)
   IPC_STRUCT_MEMBER(scoped_refptr<content::ResourceRequestBodyImpl>,
                     resource_request_body)
+  IPC_STRUCT_MEMBER(std::string, extra_headers)
   IPC_STRUCT_MEMBER(content::Referrer, referrer)
   IPC_STRUCT_MEMBER(WindowOpenDisposition, disposition)
   IPC_STRUCT_MEMBER(bool, should_replace_current_entry)
   IPC_STRUCT_MEMBER(bool, user_gesture)
   IPC_STRUCT_MEMBER(bool, is_history_navigation_in_new_child)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(FrameMsg_TextTrackSettings_Params)
   // Text tracks on/off state
   IPC_STRUCT_MEMBER(bool, text_tracks_enabled)
@@ skipping 1077 matching lines @@
 // nearest find result in the sending frame.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_GetNearestFindResult_Reply,
                     int /* nfr_request_id */,
                     float /* distance */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.