Replace deprecated base::NonThreadSafe in content/browser/appcache in favor of SequenceChecker.

content/browser/appcache/appcache_job.h

 // Copyright (c) 2017 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 CONTENT_BROWSER_APPCACHE_APPCACHE_JOB_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_JOB_H_
 
 #include <memory>
 
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequence_checker.h"
 #include "base/strings/string16.h"
-#include "base/threading/non_thread_safe.h"
 #include "content/common/content_export.h"
 #include "url/gurl.h"
 
 namespace net {
 class NetworkDelegate;
 class URLRequestJob;
 }
 
 namespace content {
 
 class AppCacheEntry;
 class AppCacheHost;
 class AppCacheRequest;
 class AppCacheStorage;
 class AppCacheURLLoaderJob;
 class URLRequestJob;
 
 // Interface for an AppCache job. This is used to send data stored in the
 // AppCache to networking consumers.
 // Subclasses implement this interface to wrap custom job objects like
 // URLRequestJob, URLLoaderJob, etc to ensure that these dependencies stay out
 // of the AppCache code.
-class CONTENT_EXPORT AppCacheJob
-    : NON_EXPORTED_BASE(public base::NonThreadSafe),
-      public base::SupportsWeakPtr<AppCacheJob> {
+class CONTENT_EXPORT AppCacheJob : public base::SupportsWeakPtr<AppCacheJob> {
  public:
   // Callback that will be invoked before the request is restarted. The caller
   // can use this opportunity to grab state from the job to determine how it
   // should behave when the request is restarted.
   // TODO(ananta)
   // This applies only to the URLRequestJob at the moment. Look into taking
   // this knowledge out of this class.
   using OnPrepareToRestartCallback = base::Closure;
 
   // Factory function to create the AppCacheJob instance for the |request|
@@ skipping 55 matching lines @@
   // AppCaches loaded via the URLLoader mechanism.
   virtual net::URLRequestJob* AsURLRequestJob();
 
   // Returns the underlying ApppCacheURLLoaderJob if any. This only applies to
   // AppCaches loaded via the URLRequest mechanism.
   virtual AppCacheURLLoaderJob* AsURLLoaderJob();
 
  protected:
   AppCacheJob();
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   base::WeakPtrFactory<AppCacheJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheJob);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_JOB_H_