Adding ThreadChecker validation to d'tors for host classes

remoting/host/win/elevated_native_messaging_host.cc

Index: remoting/host/win/elevated_native_messaging_host.cc
diff --git a/remoting/host/win/elevated_native_messaging_host.cc b/remoting/host/win/elevated_native_messaging_host.cc
index 0e2dcddb5729419cdbae347183e320e50be71b7c..9471e52a010e70e3b82f6d4cce64e447ce7300be 100644
--- a/remoting/host/win/elevated_native_messaging_host.cc
+++ b/remoting/host/win/elevated_native_messaging_host.cc
@@ -32,7 +32,9 @@ ElevatedNativeMessagingHost::ElevatedNativeMessagingHost(
       host_process_timeout_(host_timeout),
       client_(client) {}
 
-ElevatedNativeMessagingHost::~ElevatedNativeMessagingHost() {}
+ElevatedNativeMessagingHost::~ElevatedNativeMessagingHost() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
 
 void ElevatedNativeMessagingHost::OnMessage(
     std::unique_ptr<base::Value> message) {