Re-enable preferences service access for browser+ash

chrome/browser/prefs/preferences_service.cc

Index: chrome/browser/prefs/preferences_service.cc
diff --git a/chrome/browser/prefs/preferences_service.cc b/chrome/browser/prefs/preferences_service.cc
index 5494965b3ff818ad0eaa55cac18bd526989dd1a5..85b9c2a5763096657b7e00b0d2729a6f354ea13a 100644
--- a/chrome/browser/prefs/preferences_service.cc
+++ b/chrome/browser/prefs/preferences_service.cc
@@ -33,7 +33,8 @@ void PreferencesService::PreferenceChanged(const std::string& preference_name) {
       service_->FindPreference(preference_name);
   std::unique_ptr<base::DictionaryValue> dictionary =
       base::MakeUnique<base::DictionaryValue>();
-  dictionary->Set(preference_name, pref->GetValue()->CreateDeepCopy());
+  dictionary->SetWithoutPathExpansion(preference_name,
+                                      pref->GetValue()->CreateDeepCopy());
   client_->OnPreferencesChanged(std::move(dictionary));
 }
 
@@ -73,7 +74,7 @@ void PreferencesService::Subscribe(
     preferences_change_registrar_->Add(
         it, base::Bind(&PreferencesService::PreferenceChanged,
                        base::Unretained(this)));
-    dictionary->Set(it, pref->GetValue()->CreateDeepCopy());
+    dictionary->SetWithoutPathExpansion(it, pref->GetValue()->CreateDeepCopy());
   }
 
   if (dictionary->empty())