Send a message to the client if bad It2Me policies are read.

remoting/host/it2me/it2me_native_messaging_host.h

Index: remoting/host/it2me/it2me_native_messaging_host.h
diff --git a/remoting/host/it2me/it2me_native_messaging_host.h b/remoting/host/it2me/it2me_native_messaging_host.h
index 948c41a8c004e04db398e1f473f0228227f17cf4..09f7cb8b6b845311325a9104985b0a30a0683c7f 100644
--- a/remoting/host/it2me/it2me_native_messaging_host.h
+++ b/remoting/host/it2me/it2me_native_messaging_host.h
@@ -72,6 +72,7 @@ class It2MeNativeMessagingHost : public It2MeHost::Observer,
                          std::unique_ptr<base::DictionaryValue> response);
   void SendErrorAndExit(std::unique_ptr<base::DictionaryValue> response,
                         const std::string& description) const;
+  void SendPolicyErrorAndExit() const;
   void SendMessageToClient(std::unique_ptr<base::Value> message) const;
 
   // Callback for DelegatingSignalStrategy.
@@ -80,6 +81,9 @@ class It2MeNativeMessagingHost : public It2MeHost::Observer,
   // Called when initial policies are read and when they change.
   void OnPolicyUpdate(std::unique_ptr<base::DictionaryValue> policies);
 
+  // Called when malformed policies are detected.
+  void OnPolicyError();
+
   // Returns whether the request was successfully sent to the elevated host.
   bool DelegateToElevatedHost(std::unique_ptr<base::DictionaryValue> message);