Adding ThreadChecker validation to d'tors for host classes

remoting/host/win/elevated_native_messaging_host.cc

 // Copyright 2016 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 "remoting/host/win/elevated_native_messaging_host.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
@@ skipping 14 matching lines @@
     intptr_t parent_window_handle,
     bool elevate_process,
     base::TimeDelta host_timeout,
     extensions::NativeMessageHost::Client* client)
     : host_binary_path_(binary_path),
       parent_window_handle_(parent_window_handle),
       elevate_host_process_(elevate_process),
       host_process_timeout_(host_timeout),
       client_(client) {}
 
-ElevatedNativeMessagingHost::~ElevatedNativeMessagingHost() {}
+ElevatedNativeMessagingHost::~ElevatedNativeMessagingHost() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
 
 void ElevatedNativeMessagingHost::OnMessage(
     std::unique_ptr<base::Value> message) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // Simply pass along the response from the elevated host to the client.
   std::string message_json;
   base::JSONWriter::Write(*message, &message_json);
   client_->PostMessageFromNativeHost(message_json);
 }
@@ skipping 41 matching lines @@
 }
 
 void ElevatedNativeMessagingHost::DisconnectHost() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // This will send an EOF to the elevated host, triggering its shutdown.
   elevated_channel_.reset();
 }
 
 }  // namespace remoting