Remove C++11-specific warning about std::move.

Change-Id: Ifc9324eff57b49521367d2d1ce3b003def96798f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/710836
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
2 files changed