Create TetherService, a TetherAllowed pref, and use DependencyManager for RegisterProfilePrefs call…

chrome/browser/cryptauth/chrome_cryptauth_service_factory.cc

 // Copyright 2017 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/cryptauth/chrome_cryptauth_service_factory.h"
 
 #include "chrome/browser/cryptauth/chrome_cryptauth_service.h"
 #include "chrome/browser/gcm/gcm_profile_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/pref_registry/pref_registry_syncable.h"
 
 // static
 cryptauth::CryptAuthService*
 ChromeCryptAuthServiceFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<ChromeCryptAuthService*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
@@ skipping 10 matching lines @@
   DependsOn(gcm::GCMProfileServiceFactory::GetInstance());
 }
 
 ChromeCryptAuthServiceFactory::~ChromeCryptAuthServiceFactory() {}
 
 KeyedService* ChromeCryptAuthServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = Profile::FromBrowserContext(context);
   return ChromeCryptAuthService::Create(profile).release();
 }
+
+void ChromeCryptAuthServiceFactory::RegisterProfilePrefs(
+    user_prefs::PrefRegistrySyncable* registry) {
+  cryptauth::CryptAuthService::RegisterProfilePrefs(registry);
+}