[NoStatePrefetch] Do not send responses to renderer in prefetch mode.

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.
 //
 // NOTE: All messages must send an |int request_id| as their first parameter.
 
 // Multiply-included message file, hence no include guard.
 
@@ skipping 231 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(parent_render_frame_id)
   IPC_STRUCT_TRAITS_MEMBER(transition_type)
   IPC_STRUCT_TRAITS_MEMBER(should_replace_current_entry)
   IPC_STRUCT_TRAITS_MEMBER(transferred_request_child_id)
   IPC_STRUCT_TRAITS_MEMBER(transferred_request_request_id)
   IPC_STRUCT_TRAITS_MEMBER(allow_download)
   IPC_STRUCT_TRAITS_MEMBER(report_raw_headers)
   IPC_STRUCT_TRAITS_MEMBER(lofi_state)
   IPC_STRUCT_TRAITS_MEMBER(resource_body_stream_url)
   IPC_STRUCT_TRAITS_MEMBER(initiated_in_secure_context)
+  IPC_STRUCT_TRAITS_MEMBER(is_prefetch_only)
 IPC_STRUCT_TRAITS_END()
 
 // Parameters for a ResourceMsg_RequestComplete
 IPC_STRUCT_TRAITS_BEGIN(content::ResourceRequestCompletionStatus)
   IPC_STRUCT_TRAITS_MEMBER(error_code)
   IPC_STRUCT_TRAITS_MEMBER(was_ignored_by_handler)
   IPC_STRUCT_TRAITS_MEMBER(exists_in_cache)
   IPC_STRUCT_TRAITS_MEMBER(security_info)
   IPC_STRUCT_TRAITS_MEMBER(completion_time)
   IPC_STRUCT_TRAITS_MEMBER(encoded_data_length)
@@ skipping 113 matching lines @@
 
 // Sent when the renderer process deletes a resource loader.
 IPC_MESSAGE_CONTROL1(ResourceHostMsg_ReleaseDownloadedFile,
                      int /* request_id */)
 
 // Sent by the renderer when a resource request changes priority.
 IPC_MESSAGE_CONTROL3(ResourceHostMsg_DidChangePriority,
                      int /* request_id */,
                      net::RequestPriority,
                      int /* intra_priority_value */)