Re-enable preferences service access for browser+ash

services/preferences/public/cpp/pref_client_store.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/preferences/public/cpp/pref_client_store.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "services/service_manager/public/cpp/connector.h"
 
@@ skipping 64 matching lines @@
 }
 
 PrefClientStore::~PrefClientStore() {}
 
 void PrefClientStore::SetValueOnPreferenceManager(const std::string& key,
                                                   const base::Value& value) {
   if (keys_.find(key) == keys_.end())
     return;
 
   auto prefs = base::MakeUnique<base::DictionaryValue>();
-  prefs->Set(key, value.CreateDeepCopy());
+  prefs->SetWithoutPathExpansion(key, value.CreateDeepCopy());
   prefs_service_ptr_->SetPreferences(std::move(prefs));
 }
 
 void PrefClientStore::OnPreferencesChanged(
     std::unique_ptr<base::DictionaryValue> preferences) {
   if (!initialized_) {
     initialized_ = true;
     NotifyInitializationCompleted();
   }
 
   for (base::DictionaryValue::Iterator it(*preferences); !it.IsAtEnd();
        it.Advance()) {
     if (keys_.find(it.key()) == keys_.end())
       continue;
     ValueMapPrefStore::SetValue(it.key(), it.value().CreateDeepCopy(), 0);
   }
 }
 
 }  // namespace preferences