Remove dependency on //content from history DownloadDatabase

components/history/content/browser/download_constants_utils.h

+// Copyright 2015 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 COMPONENTS_HISTORY_CONTENT_BROWSER_DOWNLOAD_CONSTANTS_UTILS_H_
+#define COMPONENTS_HISTORY_CONTENT_BROWSER_DOWNLOAD_CONSTANTS_UTILS_H_
+
+#include <string>
+
+#include "components/history/core/browser/download_types.h"
+#include "content/public/browser/download_danger_type.h"
+#include "content/public/browser/download_interrupt_reasons.h"
+#include "content/public/browser/download_item.h"
+
+namespace history {
+
+// Utility functions to convert between content::DownloadItem::DownloadState
+// enumeration and history::DownloadState constants.
+content::DownloadItem::DownloadState ToContentDownloadState(
+    DownloadState state);
+DownloadState ToHistoryDownloadState(
+    content::DownloadItem::DownloadState state);
+
+// Utility functions to convert between content::DownloadDangerType enumeration
+// and history::DownloadDangerType constants.
+content::DownloadDangerType ToContentDownloadDangerType(
+    DownloadDangerType danger_type);
+DownloadDangerType ToHistoryDownloadDangerType(
+    content::DownloadDangerType danger_type);
+
+// Utility functions to convert between content::DownloadInterrupReason
+// enumeration and history::DownloadInterruptReason type (value have no
+// meaning in history, but have a different type to avoid bugs due to
+// implicit conversions).
+content::DownloadInterruptReason ToContentDownloadInterruptReason(
+    DownloadInterruptReason interrupt_reason);
+DownloadInterruptReason ToHistoryDownloadInterruptReason(
+    content::DownloadInterruptReason interrupt_reason);
+
+// Utility functions to convert between content download id values and
+// history::DownloadId type (value have no meaning in history, except
+// for kInvalidDownloadId).
+uint32 ToContentDownloadId(DownloadId id);
+DownloadId ToHistoryDownloadId(uint32 id);
+}  // namespace history
+
+#endif  // COMPONENTS_HISTORY_CONTENT_BROWSER_DOWNLOAD_CONSTANTS_UTILS_H_