Add #include <utility> for std::move

Code is using std::move, defined in <utility>. Maybe clang-tidy has a
feature for this, but anyho.

Tbr: slangley
Bug: 841659
Change-Id: I01d81203a77e96bc0115980eda43a442944abb31
Reviewed-on: https://chromium-review.googlesource.com/1056508Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558123}

chrome/browser/chromeos/file_manager/file_manager_browsertest_base.cc

@@ -5,7 +5,9 @@
 #include "chrome/browser/chromeos/file_manager/file_manager_browsertest_base.h"
 
 #include <stddef.h>
+
 #include <memory>
+#include <utility>
 
 #include "base/containers/circular_deque.h"
 #include "base/json/json_reader.h"