Adding ThreadChecker validation to d'tors for host classes

remoting/host/security_key/security_key_extension_session.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/security_key/security_key_extension_session.h"
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
@@ skipping 57 matching lines @@
     : client_stub_(client_stub) {
   DCHECK(client_stub_);
 
   security_key_auth_handler_ = remoting::SecurityKeyAuthHandler::Create(
       client_session_details,
       base::Bind(&SecurityKeyExtensionSession::SendMessageToClient,
                  base::Unretained(this)),
       file_task_runner);
 }
 
-SecurityKeyExtensionSession::~SecurityKeyExtensionSession() {}
+SecurityKeyExtensionSession::~SecurityKeyExtensionSession() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
 
 // Returns true if the |message| is a Security Key ExtensionMessage.
 // This is done so the host does not pass |message| to other HostExtensions.
 // TODO(joedow): Use |client_session_details| to disconnect the session if we
 //               receive an invalid extension message.
 bool SecurityKeyExtensionSession::OnExtensionMessage(
     ClientSessionDetails* client_session_details,
     protocol::ClientStub* client_stub,
     const protocol::ExtensionMessage& message) {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ skipping 116 matching lines @@
     std::unique_ptr<SecurityKeyAuthHandler> security_key_auth_handler) {
   DCHECK(security_key_auth_handler);
 
   security_key_auth_handler_ = std::move(security_key_auth_handler);
   security_key_auth_handler_->SetSendMessageCallback(
       base::Bind(&SecurityKeyExtensionSession::SendMessageToClient,
                  base::Unretained(this)));
 }
 
 }  // namespace remoting