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

base/prefs/pref_notifier_impl.cc

Index: base/prefs/pref_notifier_impl.cc
diff --git a/chrome/browser/prefs/pref_notifier_impl.cc b/base/prefs/pref_notifier_impl.cc
similarity index 97%
rename from chrome/browser/prefs/pref_notifier_impl.cc
rename to base/prefs/pref_notifier_impl.cc
index 9bdf32221978b811a9608867921152df309f6b6a..1fa495df0f0a7be4eb89d81bc0bc3d531b386ace 100644
--- a/chrome/browser/prefs/pref_notifier_impl.cc
+++ b/base/prefs/pref_notifier_impl.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/prefs/pref_notifier_impl.h"
+#include "base/prefs/pref_notifier_impl.h"
 
 #include "base/logging.h"
+#include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
-#include "chrome/browser/prefs/pref_service.h"
 
 PrefNotifierImpl::PrefNotifierImpl()
     : pref_service_(NULL) {