Allow policy refresh rate to be configured through policy.

chrome/browser/policy/configuration_policy_provider.cc

 // Copyright (c) 2011 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/policy/configuration_policy_provider.h"
 
 #include "base/values.h"
 
 namespace policy {
 
@@ skipping 16 matching lines @@
     if (policies->Get(i->name, &value) && value->IsType(i->value_type))
       store->Apply(i->policy_type, value->DeepCopy());
   }
 
   // TODO(mnissler): Handle preference overrides once |ConfigurationPolicyStore|
   // supports it.
 }
 
 // Class ConfigurationPolicyObserverRegistrar.
 
-ConfigurationPolicyObserverRegistrar::ConfigurationPolicyObserverRegistrar() {}
+ConfigurationPolicyObserverRegistrar::ConfigurationPolicyObserverRegistrar()
+  : provider_(NULL),
+    observer_(NULL) {}
 
 ConfigurationPolicyObserverRegistrar::~ConfigurationPolicyObserverRegistrar() {
   if (provider_)
     provider_->RemoveObserver(this);
 }
 
 void ConfigurationPolicyObserverRegistrar::Init(
     ConfigurationPolicyProvider* provider,
     ConfigurationPolicyProvider::Observer* observer) {
   provider_ = provider;
   observer_ = observer;
   provider_->AddObserver(this);
 }
 
 void ConfigurationPolicyObserverRegistrar::OnUpdatePolicy() {
   observer_->OnUpdatePolicy();
 }
 
 void ConfigurationPolicyObserverRegistrar::OnProviderGoingAway() {
   observer_->OnProviderGoingAway();
   provider_->RemoveObserver(this);
   provider_ = NULL;
 }
 
 }  // namespace policy