sync: Store hard coded constants into its header file.

chrome/browser/sync/tools/sync_constants.cc

Index: chrome/browser/sync/tools/sync_constants.cc
diff --git a/chrome/browser/sync/tools/sync_constants.cc b/chrome/browser/sync/tools/sync_constants.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bf9c0d14932c2e40cc1fea5dae3c344e726d4f70
--- /dev/null
+++ b/chrome/browser/sync/tools/sync_constants.cc
@@ -0,0 +1,14 @@
+// Copyright (c) 2010 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 "chrome/browser/sync/tools/sync_constants.h"
+
+namespace sync_tools {
+
+const char kAutoFillType[] = "AUTOFILL";
+const char kBookmarkType[] = "BOOKMARK";
+const char kPreferenceType[] = "PREFERENCE";
+const char kThemeType[] = "THEME";
+
+}  // namespace sync_tools