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

content/shell/browser/layout_test/blink_test_controller.h

 // Copyright 2013 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_SHELL_BROWSER_LAYOUT_TEST_BLINK_TEST_CONTROLLER_H_
 #define CONTENT_SHELL_BROWSER_LAYOUT_TEST_BLINK_TEST_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 #include <ostream>
 #include <set>
 #include <string>
 
 #include "base/cancelable_callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/scoped_observer.h"
+#include "base/sequence_checker.h"
 #include "base/synchronization/lock.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "content/public/browser/bluetooth_chooser.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/render_process_host_observer.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/web_preferences.h"
 #include "content/shell/common/layout_test.mojom.h"
@@ skipping 76 matching lines @@
 
   bool capture_text_only_;
   bool encode_binary_data_;
 
   std::ostream* output_;
   std::ostream* error_;
 
   DISALLOW_COPY_AND_ASSIGN(BlinkTestResultPrinter);
 };
 
-class BlinkTestController : public base::NonThreadSafe,
-                            public WebContentsObserver,
+class BlinkTestController : public WebContentsObserver,
                             public RenderProcessHostObserver,
                             public NotificationObserver,
                             public GpuDataManagerObserver {
  public:
   static BlinkTestController* Get();
 
   BlinkTestController();
   ~BlinkTestController() override;
 
   // True if the controller is ready for testing.
@@ skipping 164 matching lines @@
 
   // Map from one frame to one mojo pipe.
   std::map<RenderFrameHost*, mojom::LayoutTestControlAssociatedPtr>
       layout_test_control_map_;
 #if defined(OS_ANDROID)
   // Because of the nested message pump implementation, Android needs to allow
   // waiting on the UI thread while layout tests are being ran.
   ScopedAllowWaitForAndroidLayoutTests reduced_restrictions_;
 #endif
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(BlinkTestController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_BLINK_TEST_CONTROLLER_H_