Move constants used by history component to history namespace

components/history/core/browser/history_constants.cc

+// 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.
+
+#include "components/history/core/browser/history_constants.h"
+
+#include "base/files/file_path.h"
+
+#define FPL FILE_PATH_LITERAL
+
+namespace history {
+
+// filenames
+#if defined(OS_ANDROID)
+const base::FilePath::CharType kAndroidCacheFilename[] = FPL("AndroidCache");
+#endif
+const base::FilePath::CharType kArchivedHistoryFilename[] =
+    FPL("Archived History");
+const base::FilePath::CharType kFaviconsFilename[] = FPL("Favicons");
+const base::FilePath::CharType kHistoryFilename[] = FPL("History");
+const base::FilePath::CharType kThumbnailsFilename[] = FPL("Thumbnails");
+
+}  // namespace history