Implement new-style CloudPolicyStore for Chrome OS device policy.

chrome/browser/chromeos/settings/device_settings_service.cc

Index: chrome/browser/chromeos/settings/device_settings_service.cc
diff --git a/chrome/browser/chromeos/settings/device_settings_service.cc b/chrome/browser/chromeos/settings/device_settings_service.cc
index e8c03f1cb1756b3fbbef4d8178f0d7ba8cf08eee..3c55b9ba3393ef33db6de2ed3bfa1803a334515d 100644
--- a/chrome/browser/chromeos/settings/device_settings_service.cc
+++ b/chrome/browser/chromeos/settings/device_settings_service.cc
@@ -96,14 +96,14 @@ void DeviceSettingsService::SignAndStore(
           username_));
 }
 
-void DeviceSettingsService::Store(const std::string& policy_blob,
+void DeviceSettingsService::Store(scoped_ptr<em::PolicyFetchResponse> policy,
                                   const base::Closure& callback) {
   Enqueue(
       new StoreSettingsOperation(
           base::Bind(&DeviceSettingsService::HandleCompletedOperation,
                      weak_factory_.GetWeakPtr(),
                      callback),
-          policy_blob));
+          policy.Pass()));
 }
 
 DeviceSettingsService::OwnershipStatus