cashew: support "usage requests allowed OTA only" policy

src/default_policy.cc

 // Copyright (c) 2010 The Chromium OS 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 "src/default_policy.h"
 
 #include <glog/logging.h>
 
 namespace cashew {
 
@@ skipping 13 matching lines @@
 guint DefaultPolicy::GetUpdateTimerIdleSecs(const DataPlanList& plans) const {
   return kDefaultPolicyUpdateTimerIdleSecs;
 }
 
 bool DefaultPolicy::ShouldEmitDataPlansUpdate(const DataPlanList& old_plans,
     const DataPlanList& new_plans) const {
   // unconditionally send an update
   return true;
 }
 
+bool DefaultPolicy::UsageRequestsMustBeSentOTA() const {
+  return true;
+}
+
 // private methods
 
 }  // namespace cashew