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

chrome/browser/sync/test/integration/bookmarks_helper.cc

Index: chrome/browser/sync/test/integration/bookmarks_helper.cc
diff --git a/chrome/browser/sync/test/integration/bookmarks_helper.cc b/chrome/browser/sync/test/integration/bookmarks_helper.cc
index a21790c426078536927c1ab417700b745b2dd284..264691a6bbe6b29faf38e91d7fc99c6193525953 100644
--- a/chrome/browser/sync/test/integration/bookmarks_helper.cc
+++ b/chrome/browser/sync/test/integration/bookmarks_helper.cc
@@ -320,8 +320,7 @@ void WaitForHistoryToProcessPendingTasks() {
     base::WaitableEvent done(false, false);
     base::CancelableTaskTracker task_tracker;
     history_service->ScheduleDBTask(
-        scoped_ptr<history::HistoryDBTask>(
-            new HistoryEmptyTask(&done)),
+        std::unique_ptr<history::HistoryDBTask>(new HistoryEmptyTask(&done)),
         &task_tracker);
     done.Wait();
   }