[Download] Return DownloadInterruptReason from OnStartedCallback

content/public/browser/download_interrupt_reasons.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 CONTENT_PUBLIC_BROWSER_DOWNLOAD_INTERRUPT_REASONS_H_
 #define CONTENT_PUBLIC_BROWSER_DOWNLOAD_INTERRUPT_REASONS_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
 
 namespace content {
 
 enum DownloadInterruptReason {
   DOWNLOAD_INTERRUPT_REASON_NONE = 0,
 
 #define INTERRUPT_REASON(name, value)  DOWNLOAD_INTERRUPT_REASON_##name = value,
 
 #include "content/public/browser/download_interrupt_reason_values.h"
 
 #undef INTERRUPT_REASON
 };
 
-std::string CONTENT_EXPORT InterruptReasonDebugString(
+std::string CONTENT_EXPORT DownloadInterruptReasonToString(
     DownloadInterruptReason error);
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_INTERRUPT_REASONS_H_