Convert //chrome/browser/sync_file_system from scoped_ptr to std::unique_ptr

chrome/browser/sync_file_system/drive_backend/list_changes_task.h

Index: chrome/browser/sync_file_system/drive_backend/list_changes_task.h
diff --git a/chrome/browser/sync_file_system/drive_backend/list_changes_task.h b/chrome/browser/sync_file_system/drive_backend/list_changes_task.h
index 7e9255e8e220e7c95c072337960af5823f277a1f..9b47673eccafec5ee3c352246274583d014c127f 100644
--- a/chrome/browser/sync_file_system/drive_backend/list_changes_task.h
+++ b/chrome/browser/sync_file_system/drive_backend/list_changes_task.h
@@ -7,8 +7,9 @@
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/sync_file_system/drive_backend/sync_task.h"
@@ -34,15 +35,15 @@ class ListChangesTask : public SyncTask {
   explicit ListChangesTask(SyncEngineContext* sync_context);
   ~ListChangesTask() override;
 
-  void RunPreflight(scoped_ptr<SyncTaskToken> token) override;
+  void RunPreflight(std::unique_ptr<SyncTaskToken> token) override;
 
  private:
-  void StartListing(scoped_ptr<SyncTaskToken> token);
-  void DidListChanges(scoped_ptr<SyncTaskToken> token,
+  void StartListing(std::unique_ptr<SyncTaskToken> token);
+  void DidListChanges(std::unique_ptr<SyncTaskToken> token,
                       google_apis::DriveApiErrorCode error,
-                      scoped_ptr<google_apis::ChangeList> change_list);
+                      std::unique_ptr<google_apis::ChangeList> change_list);
   void CheckInChangeList(int64_t largest_change_id,
-                         scoped_ptr<SyncTaskToken> token);
+                         std::unique_ptr<SyncTaskToken> token);
 
   bool IsContextReady();
   MetadataDatabase* metadata_database();