Factor out common Element struct from BlobData and ResourceRequestBody

content/common/fileapi/webblob_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 HTML5 Blob.
 // Multiply-included message file, hence no include guard.
 
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/webkit_param_traits.h"
 #include "ipc/ipc_message_macros.h"
 
 #define IPC_MESSAGE_START BlobMsgStart
 
-IPC_ENUM_TRAITS(webkit_blob::BlobData::Type)
-
-IPC_STRUCT_TRAITS_BEGIN(webkit_blob::BlobData::Item)
-  IPC_STRUCT_TRAITS_MEMBER(type)
-  IPC_STRUCT_TRAITS_MEMBER(data)
-  IPC_STRUCT_TRAITS_MEMBER(file_path)
-  IPC_STRUCT_TRAITS_MEMBER(blob_url)
-  IPC_STRUCT_TRAITS_MEMBER(offset)
-  IPC_STRUCT_TRAITS_MEMBER(length)
-  IPC_STRUCT_TRAITS_MEMBER(expected_modification_time)
-IPC_STRUCT_TRAITS_END()
-
 // Blob messages sent from the renderer to the browser.
 
-
 // Registers a blob as being built.
 IPC_MESSAGE_CONTROL1(BlobHostMsg_StartBuildingBlob,
                      GURL /* url */)
 
 // Appends data to a blob being built.
 IPC_MESSAGE_CONTROL2(BlobHostMsg_AppendBlobDataItem,
                      GURL /* url */,
                      webkit_blob::BlobData::Item)
 
 // Appends data to a blob being built.
 IPC_SYNC_MESSAGE_CONTROL3_0(BlobHostMsg_SyncAppendSharedMemory,
                             GURL /* url */,
                             base::SharedMemoryHandle,
                             size_t /* buffer size */)
 
 // Finishes building a blob.
 IPC_MESSAGE_CONTROL2(BlobHostMsg_FinishBuildingBlob,
                      GURL /* url */,
                      std::string /* content_type */)
 
 // Creates a new blob that's a clone of an existing src blob.
 // The source blob must be fully built.
 IPC_MESSAGE_CONTROL2(BlobHostMsg_CloneBlob,
                      GURL /* url */,
                      GURL /* src_url */)
 
 // Removes a blob.
 IPC_MESSAGE_CONTROL1(BlobHostMsg_RemoveBlob,
                      GURL /* url */)