Move constants used by history component to history namespace

components/history/core/browser/history_constants.h

Index: components/history/core/browser/history_constants.h
diff --git a/components/history/core/browser/history_constants.h b/components/history/core/browser/history_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..910b4ca7f33e5fe0937cee2954d2529c381089b6
--- /dev/null
+++ b/components/history/core/browser/history_constants.h
@@ -0,0 +1,23 @@
+// Copyright 2014 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_HISTORY_CONSTANTS_H_
+#define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_CONSTANTS_H_
+
+#include "base/files/file_path.h"
+
+namespace history {
+
+// filenames
+#if defined(OS_ANDROID)
+extern const base::FilePath::CharType kAndroidCacheFilename[];
+#endif
+extern const base::FilePath::CharType kArchivedHistoryFilename[];
+extern const base::FilePath::CharType kFaviconsFilename[];
+extern const base::FilePath::CharType kHistoryFilename[];
+extern const base::FilePath::CharType kThumbnailsFilename[];
+
+}  // namespace history
+
+#endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_CONSTANTS_H_