[Sync] Stop accessing BrowserContextKeyedServiceFactory on non-UI thread.

chrome/browser/extensions/api/storage/settings_apitest.cc

Index: chrome/browser/extensions/api/storage/settings_apitest.cc
diff --git a/chrome/browser/extensions/api/storage/settings_apitest.cc b/chrome/browser/extensions/api/storage/settings_apitest.cc
index e0c56008abffb2bb5f8f83037da5a3fc9937b950..07ea411f58564fcd383ee46f8dec076445ddcfbe 100644
--- a/chrome/browser/extensions/api/storage/settings_apitest.cc
+++ b/chrome/browser/extensions/api/storage/settings_apitest.cc
@@ -113,8 +113,10 @@ class ExtensionSettingsApiTest : public ExtensionApiTest {
   }
 
   syncer::SyncableService* GetSyncableService() {
-    return settings_sync_util::GetSyncableService(browser()->profile(),
-                                                  kModelType);
+    return settings_sync_util::GetSyncableServiceProvider(browser()->profile(),
+                                                          kModelType)
+        .Run()
+        .get();
   }
 
   void InitSync(syncer::SyncChangeProcessor* sync_processor) {