Remove dependency on //content from history DownloadDatabase

components/history/core/browser/download_constants.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_CORE_BROWSER_DOWNLOAD_CONSTANTS_H_
+#define COMPONENTS_HISTORY_CORE_BROWSER_DOWNLOAD_CONSTANTS_H_
+
+#include "components/history/core/browser/download_types.h"
+
+namespace history {
+
+// DownloadState represents the state of a DownloadRow saved into the
+// DownloadDatabase. The values must not be changed as they are saved
+// to disk in the database.
+enum class DownloadState {
+  INVALID = -1,
+  IN_PROGRESS = 0,
+  COMPLETE = 1,
+  CANCELLED = 2,
+  BUG_140687 = 3,
+  INTERRUPTED = 4,
+};
+
+// DownloadDangerType represents the danger of a DownloadRow into the
+// DownloadDatabase. The values must not be changed as they are saved
+// to disk in the database.
+enum class DownloadDangerType {
+  INVALID = -1,
+  NOT_DANGEROUS = 0,
+  DANGEROUS_FILE = 1,
+  DANGEROUS_URL = 2,
+  DANGEROUS_CONTENT = 3,
+  MAYBE_DANGEROUS_CONTENT = 4,
+  UNCOMMON_CONTENT = 5,
+  USER_VALIDATED = 6,
+  DANGEROUS_HOST = 7,
+  POTENTIALLY_UNWANTED = 8,
+};
+
+// DownloadId represents the id of a DownloadRow into the DownloadDatabase.
+// The value is controlled by the embedder except for the reserved id
+// kInvalidDownloadId.
+extern const DownloadId kInvalidDownloadId;
+
+}  // namespace
+
+#endif  // COMPONENTS_HISTORY_CORE_BROWSER_DOWNLOAD_CONSTANTS_H_