Replace deprecated base::NonThreadSafe in chrome/browser/ssl in favor of SequenceChecker.

chrome/browser/ssl/common_name_mismatch_handler.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_SSL_COMMON_NAME_MISMATCH_HANDLER_H_
 #define CHROME_BROWSER_SSL_COMMON_NAME_MISMATCH_HANDLER_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "url/gurl.h"
 
 namespace net {
 class URLFetcher;
 }
 
 // This class handles errors due to common name mismatches
 // (|ERR_CERT_COMMON_NAME_INVALID|) and helps remediate them by suggesting
 // alternative URLs that may be what the user intended to load.
-class CommonNameMismatchHandler : public net::URLFetcherDelegate,
-                                  public base::NonThreadSafe {
+class CommonNameMismatchHandler : public net::URLFetcherDelegate {
  public:
   enum SuggestedUrlCheckResult {
     // The request succeeds with good response code i.e. URL exists and its
     // certificate is valid.
     SUGGESTED_URL_AVAILABLE,
     // Suggested URL is either not available or has a bad certificate.
     SUGGESTED_URL_NOT_AVAILABLE
   };
 
   enum TestingState {
@@ skipping 40 matching lines @@
 
   // Returns true if the check is currently running.
   bool IsCheckingSuggestedUrl() const;
 
   static TestingState testing_state_;
   const GURL request_url_;
   scoped_refptr<net::URLRequestContextGetter> request_context_;
   CheckUrlCallback check_url_callback_;
   std::unique_ptr<net::URLFetcher> url_fetcher_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(CommonNameMismatchHandler);
 };
 
 #endif  // CHROME_BROWSER_SSL_COMMON_NAME_MISMATCH_HANDLER_H_