[Sync] Move some things from driver to base.

components/sync/base/pref_names.cc

Index: components/sync/base/pref_names.cc
diff --git a/components/sync/driver/pref_names.cc b/components/sync/base/pref_names.cc
similarity index 99%
rename from components/sync/driver/pref_names.cc
rename to components/sync/base/pref_names.cc
index 45ff7ffce896c239dd6b1f2ea36ec95a167b4057..c98314b3a03d7bad54c2bef0a0042cc096ddd87f 100644
--- a/components/sync/driver/pref_names.cc
+++ b/components/sync/base/pref_names.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/sync/driver/pref_names.h"
+#include "components/sync/base/pref_names.h"
 
 namespace syncer {