sync: move internal_api components used by chrome/browser into internal_api/public

sync/util/experiments.h

-// Copyright (c) 2012 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 SYNC_UTIL_EXPERIMENTS_
-#define SYNC_UTIL_EXPERIMENTS_
-#pragma once
-
-#include "sync/internal_api/public/syncable/model_type.h"
-
-namespace browser_sync {
-
-// A structure to hold the enable status of experimental sync features.
-struct Experiments {
-  Experiments() : sync_tab_favicons(false) {}
-
-  bool Matches(const Experiments& rhs) {
-    return (sync_tab_favicons == rhs.sync_tab_favicons);
-  }
-
-  // Enable syncing of favicons within tab sync (only has an effect if tab sync
-  // is already enabled). This takes effect on the next restart.
-  bool sync_tab_favicons;
-};
-
-}
-
-#endif  // SYNC_UTIL_EXPERIMENTS_