Move //c/b/services/gcm/ to //c/b/gcm/

chrome/browser/services/gcm/gcm_product_util.h

-// Copyright 2016 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 CHROME_BROWSER_SERVICES_GCM_GCM_PRODUCT_UTIL_H_
-#define CHROME_BROWSER_SERVICES_GCM_GCM_PRODUCT_UTIL_H_
-
-#include <string>
-
-class PrefRegistrySimple;
-class PrefService;
-
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
-
-namespace gcm {
-
-// Returns a string like "com.chrome.macosx" that should be used as the GCM
-// category when an app_id is sent as a subtype instead of as a category. This
-// is generated once, then remains fixed forever (even if the product name
-// changes), since it must match existing Instance ID tokens.
-std::string GetProductCategoryForSubtypes(PrefService* prefs);
-
-void RegisterPrefs(PrefRegistrySimple* registry);
-void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
-
-}  // namespace gcm
-
-#endif  // CHROME_BROWSER_SERVICES_GCM_GCM_PRODUCT_UTIL_H_