Remove dependency on //content from history DownloadDatabase

components/history/core/browser/download_constants.h

Index: components/history/core/browser/download_constants.h
diff --git a/components/history/core/browser/download_constants.h b/components/history/core/browser/download_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..ea6889fbdb30424b4d42f00f3befe3ae81b620d3
--- /dev/null
+++ b/components/history/core/browser/download_constants.h
@@ -0,0 +1,47 @@
+// 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.
+extern const DownloadState kStateInvalid;
+extern const DownloadState kStateInProgress;
+extern const DownloadState kStateComplete;
+extern const DownloadState kStateCancelled;
+extern const DownloadState kStateBug140687;
+extern const DownloadState kStateInterrupted;
+
+DownloadState IntToDownloadState(int state);
+
+// 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.
+extern const DownloadDangerType kDangerTypeInvalid;
+extern const DownloadDangerType kDangerTypeNotDangerous;
+extern const DownloadDangerType kDangerTypeDangerousFile;
+extern const DownloadDangerType kDangerTypeDangerousUrl;
+extern const DownloadDangerType kDangerTypeDangerousContent;
+extern const DownloadDangerType kDangerTypeMaybeDangerousContent;
+extern const DownloadDangerType kDangerTypeUncommonContent;
+extern const DownloadDangerType kDangerTypeUserValidated;
+extern const DownloadDangerType kDangerTypeDangerousHost;
+extern const DownloadDangerType kDangerTypePotentiallyUnwanted;
+
+DownloadDangerType IntToDownloadDangerType(int state);
+
+// 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_