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

chrome/browser/cryptauth/chrome_cryptauth_service_factory.cc

Index: chrome/browser/cryptauth/chrome_cryptauth_service_factory.cc
diff --git a/chrome/browser/cryptauth/chrome_cryptauth_service_factory.cc b/chrome/browser/cryptauth/chrome_cryptauth_service_factory.cc
index b7b1fbe55b730b614a60dd5d837edea80d92da55..441fc15826de7b2198d6026e1ef9d886fd7f4d54 100644
--- a/chrome/browser/cryptauth/chrome_cryptauth_service_factory.cc
+++ b/chrome/browser/cryptauth/chrome_cryptauth_service_factory.cc
@@ -10,6 +10,7 @@
 #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*
@@ -40,3 +41,8 @@ KeyedService* ChromeCryptAuthServiceFactory::BuildServiceInstanceFor(
   Profile* profile = Profile::FromBrowserContext(context);
   return ChromeCryptAuthService::Create(profile).release();
 }
+
+void ChromeCryptAuthServiceFactory::RegisterProfilePrefs(
+    user_prefs::PrefRegistrySyncable* registry) {
+  cryptauth::CryptAuthService::RegisterProfilePrefs(registry);
+}