Remove explicit usage of SequencedWorkerPool from UploadList.

chrome/browser/crash_upload_list/crash_upload_list_crashpad.h

 // Copyright 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_CRASH_UPLOAD_LIST_CRASH_UPLOAD_LIST_CRASHPAD_H_
 #define CHROME_BROWSER_CRASH_UPLOAD_LIST_CRASH_UPLOAD_LIST_CRASHPAD_H_
 
 #include "base/macros.h"
 #include "components/upload_list/crash_upload_list.h"
 
 namespace base {
 class FilePath;
-class SequencedWorkerPool;
+class TaskRunner;
 }
 
 // A CrashUploadList that retrieves the list of uploaded reports from the
 // Crashpad database.
 class CrashUploadListCrashpad : public CrashUploadList {
  public:
-  CrashUploadListCrashpad(
-      Delegate* delegate,
-      const scoped_refptr<base::SequencedWorkerPool>& worker_pool);
+  CrashUploadListCrashpad(Delegate* delegate,
+                          scoped_refptr<base::TaskRunner> task_runner);
 
  protected:
   ~CrashUploadListCrashpad() override;
 
   // Called on a blocking pool thread.
   void LoadUploadList(std::vector<UploadInfo>* uploads) override;
 
   void RequestSingleCrashUpload(const std::string& local_id) override;
 
   DISALLOW_COPY_AND_ASSIGN(CrashUploadListCrashpad);
 };
 
 #endif  // CHROME_BROWSER_CRASH_UPLOAD_LIST_CRASH_UPLOAD_LIST_CRASHPAD_H_