net: Fix a regression that broke file uploading with http authentication

net/base/upload_data.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.
 
 #ifndef NET_BASE_UPLOAD_DATA_H_
 #define NET_BASE_UPLOAD_DATA_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 111 matching lines @@
 
     // Reads up to |buf_len| bytes synchronously. Returns the number of bytes
     // read. This function never fails. If there's less data to read than we
     // initially observed, then pad with zero (this can happen with files).
     // |buf_len| must be greater than 0.
     int ReadSync(char* buf, int buf_len);
 
     // Returns the number of bytes remaining to read.
     uint64 BytesRemaining();
 
-    // Resets the offset to zero, so that the element can be reread.
-    void ResetOffset() { offset_ = 0; }
+    // Resets the offset to zero and closes the file stream if opened, so
+    // that the element can be reread.
+    void ResetOffset();
 
    private:
     // Returns a FileStream opened for reading for this element, positioned
     // at |file_range_offset_|. Returns NULL if the file is not openable.
     FileStream* OpenFileStream();
 
     // Reads up to |buf_len| bytes synchronously from memory (i.e. type_ is
     // TYPE_BYTES or TYPE_CHUNK).
     int ReadFromMemorySync(char* buf, int buf_len);
 
@@ skipping 132 matching lines @@
 
 inline bool operator!=(const UploadData::Element& a,
                        const UploadData::Element& b) {
   return !(a == b);
 }
 #endif  // defined(UNIT_TEST)
 
 }  // namespace net
 
 #endif  // NET_BASE_UPLOAD_DATA_H_