Suspend (rather than shut down) the host upon policy errors.

remoting/host/policy_watcher.cc

 // Copyright 2015 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.
 
 // Most of this code is copied from:
 //   src/chrome/browser/policy/asynchronous_policy_loader.{h,cc}
 
 #include "remoting/host/policy_watcher.h"
 
 #include "base/bind.h"
@@ skipping 127 matching lines @@
   // Save the new policies.
   old_policies_.swap(new_policies);
 
   // Notify our client of the changed policies.
   if (!changed_policies->empty()) {
     policy_updated_callback_.Run(changed_policies.Pass());
   }
 }
 
 void PolicyWatcher::SignalPolicyError() {
+  old_policies_->Clear();
   policy_error_callback_.Run();
 }
 
 PolicyWatcher::PolicyWatcher(
     policy::PolicyService* policy_service,
     scoped_ptr<policy::PolicyService> owned_policy_service,
     scoped_ptr<policy::ConfigurationPolicyProvider> owned_policy_provider,
     scoped_ptr<policy::SchemaRegistry> owned_schema_registry)
     : old_policies_(new base::DictionaryValue()),
       default_values_(new base::DictionaryValue()),
@@ skipping 140 matching lines @@
       policy::POLICY_SCOPE_MACHINE));
 #else
 #error OS that is not yet supported by PolicyWatcher code.
 #endif
 
   return PolicyWatcher::CreateFromPolicyLoader(policy_loader.Pass());
 #endif  // !(OS_CHROMEOS)
 }
 
 }  // namespace remoting