Move remaining non-test, non-Chrome-specific Prefs code to base/prefs/.

chrome/browser/sync/invalidations/invalidator_storage.cc

Index: chrome/browser/sync/invalidations/invalidator_storage.cc
diff --git a/chrome/browser/sync/invalidations/invalidator_storage.cc b/chrome/browser/sync/invalidations/invalidator_storage.cc
index 1f029a571ac85ba0081c299b73ecb2e2d80ad729..6affcef4f733c33cf4bbdb267c771faac276f4c7 100644
--- a/chrome/browser/sync/invalidations/invalidator_storage.cc
+++ b/chrome/browser/sync/invalidations/invalidator_storage.cc
@@ -10,11 +10,11 @@
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
+#include "base/prefs/pref_service.h"
 #include "base/string_number_conversions.h"
 #include "base/task_runner.h"
 #include "base/values.h"
 #include "chrome/browser/prefs/pref_registry_syncable.h"
-#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/pref_names.h"
 #include "sync/internal_api/public/base/model_type.h"