Remove explicit usage of SequencedWorkerPool from UploadList.

components/upload_list/crash_upload_list.h

Index: components/upload_list/crash_upload_list.h
diff --git a/components/upload_list/crash_upload_list.h b/components/upload_list/crash_upload_list.h
index 14908cf48b6459d4f2abb410adac741920a5f8a4..7e4dc8c55c825acafd770b3442284067ac6d5c40 100644
--- a/components/upload_list/crash_upload_list.h
+++ b/components/upload_list/crash_upload_list.h
@@ -11,7 +11,7 @@
 
 namespace base {
 class FilePath;
-class SequencedWorkerPool;
+class TaskRunner;
 }
 
 // An upload list manager for crash reports from breakpad.
@@ -24,7 +24,7 @@ class CrashUploadList : public UploadList {
   // Creates a new crash upload list with the given callback delegate.
   CrashUploadList(Delegate* delegate,
                   const base::FilePath& upload_log_path,
-                  const scoped_refptr<base::SequencedWorkerPool>& worker_pool);
+                  scoped_refptr<base::TaskRunner> task_runner);
 
  protected:
   ~CrashUploadList() override;