Implemented OwnerSettingsService::Set() method.

chrome/browser/chromeos/settings/device_settings_provider.h

Index: chrome/browser/chromeos/settings/device_settings_provider.h
diff --git a/chrome/browser/chromeos/settings/device_settings_provider.h b/chrome/browser/chromeos/settings/device_settings_provider.h
index c8b952e401211d14fc452bba65a7d5aa3337ff2b..b4aef5640893d3476610d8e0811656be76ba2e03 100644
--- a/chrome/browser/chromeos/settings/device_settings_provider.h
+++ b/chrome/browser/chromeos/settings/device_settings_provider.h
@@ -18,6 +18,7 @@
 #include "chrome/browser/chromeos/policy/proto/chrome_device_policy.pb.h"
 #include "chrome/browser/chromeos/settings/device_settings_service.h"
 #include "chromeos/settings/cros_settings_provider.h"
+#include "components/ownership/owner_settings_service.h"
 #include "components/policy/core/common/cloud/cloud_policy_constants.h"
 
 namespace base {
@@ -31,8 +32,13 @@ class ChromeDeviceSettingsProto;
 namespace chromeos {
 
 // CrosSettingsProvider implementation that works with device settings.
-class DeviceSettingsProvider : public CrosSettingsProvider,
-                               public DeviceSettingsService::Observer {
+//
+// Note that the write path is in the process of being migrated to
+// OwnerSettingsServiceChromeOS (crbug.com/230018).
+class DeviceSettingsProvider
+    : public CrosSettingsProvider,
+      public DeviceSettingsService::Observer,
+      public ownership::OwnerSettingsService::Observer {
  public:
   // The callback type that is called to get the device mode.
   typedef base::Callback<policy::DeviceMode(void)> GetDeviceModeCallback;
@@ -59,6 +65,10 @@ class DeviceSettingsProvider : public CrosSettingsProvider,
   virtual void OwnershipStatusChanged() override;
   virtual void DeviceSettingsUpdated() override;
 
+  // ownership::OwnerSettingsService::Observer implementation:
+  virtual void OnTentativeChangesInPolicy(
+      const enterprise_management::PolicyData& policy_data) override;
+
   // Populates in-memory cache from the local_state cache that is used to store
   // device settings before the device is owned and to speed up policy
   // availability before the policy blob is fetched on boot.