DeviceSettingsProvider's write path uses OwnerSettingsService now.

chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc

 // Copyright 2014 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 "chrome/browser/chromeos/ownership/owner_settings_service_chromeos.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 206 matching lines @@
   policy_data.set_username(user_id_);
   CHECK(device_settings_.SerializeToString(policy_data.mutable_policy_value()));
   FOR_EACH_OBSERVER(OwnerSettingsService::Observer,
                     observers_,
                     OnTentativeChangesInPolicy(policy_data));
   has_pending_changes_ = true;
   StoreDeviceSettings();
   return true;
 }
 
+bool OwnerSettingsServiceChromeOS::CommitTentativeDeviceSettings(
+    scoped_ptr<enterprise_management::PolicyData> policy) {
+  if (!IsOwner() && !IsOwnerInTests(user_id_))
+    return false;
+  if (policy->username() != user_id_) {
+    LOG(ERROR) << "Username mismatch: " << policy->username() << " vs. "
+               << user_id_;
+    return false;
+  }
+  CHECK(device_settings_.ParseFromString(policy->policy_value()));
+  FOR_EACH_OBSERVER(OwnerSettingsService::Observer,
+                    observers_,
+                    OnTentativeChangesInPolicy(*policy));
+  has_pending_changes_ = true;
+  StoreDeviceSettings();
+  return true;
+}
+
 void OwnerSettingsServiceChromeOS::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (type != chrome::NOTIFICATION_PROFILE_CREATED) {
     NOTREACHED();
     return;
   }
 
@@ skipping 363 matching lines @@
     return false;
   }
   enterprise_management::ChromeDeviceSettingsProto settings =
       *device_settings_service_->device_settings();
   settings.MergeFrom(device_settings_);
   device_settings_.Swap(&settings);
   return true;
 }
 
 }  // namespace chromeos