[Sync] Get SyncServce instead of ProfileSyncService.

chrome/browser/sync/profile_sync_service_factory.cc

Index: chrome/browser/sync/profile_sync_service_factory.cc
diff --git a/chrome/browser/sync/profile_sync_service_factory.cc b/chrome/browser/sync/profile_sync_service_factory.cc
index 957603e0707bf102c6f46a237bb5ec3aadf7eccf..f066d65c86ba709a8dfe60ff516dc6bf72fc5cfb 100644
--- a/chrome/browser/sync/profile_sync_service_factory.cc
+++ b/chrome/browser/sync/profile_sync_service_factory.cc
@@ -103,17 +103,19 @@ ProfileSyncServiceFactory* ProfileSyncServiceFactory::GetInstance() {
 // static
 ProfileSyncService* ProfileSyncServiceFactory::GetForProfile(
     Profile* profile) {
-  if (!ProfileSyncService::IsSyncAllowedByFlag())
-    return nullptr;
-
   return static_cast<ProfileSyncService*>(
-      GetInstance()->GetServiceForBrowserContext(profile, true));
+      GetSyncServiceForBrowserContext(profile));
 }
 
 // static
 syncer::SyncService* ProfileSyncServiceFactory::GetSyncServiceForBrowserContext(
     content::BrowserContext* context) {
-  return GetForProfile(Profile::FromBrowserContext(context));
+  if (!ProfileSyncService::IsSyncAllowedByFlag()) {
+    return nullptr;
+  }
+
+  return static_cast<syncer::SyncService*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 ProfileSyncServiceFactory::ProfileSyncServiceFactory()