Remove PrefService::ScheduleSavePersistentPrefs and SavePersistentPrefs.

chrome/browser/extensions/test_extension_prefs.cc

Index: chrome/browser/extensions/test_extension_prefs.cc
diff --git a/chrome/browser/extensions/test_extension_prefs.cc b/chrome/browser/extensions/test_extension_prefs.cc
index cddd5bd8ca99faf469c16a241fc27cd0c04b7d85..7b3d86f94056524f4d339d003d948006ce6c7b64 100644
--- a/chrome/browser/extensions/test_extension_prefs.cc
+++ b/chrome/browser/extensions/test_extension_prefs.cc
@@ -70,7 +70,7 @@ void TestExtensionPrefs::RecreateExtensionPrefs() {
     // need to wait for any pending I/O to complete before creating a new
     // PrefService.
     base::WaitableEvent io_finished(false, false);
-    pref_service_->SavePersistentPrefs();
+    pref_service_->CommitPendingWrite();
     EXPECT_TRUE(BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
                                         new SignalingTask(&io_finished)));