Replace skstd::exchange with std::exchange

Change-Id: Id8065e4ff7299c12b1469468dab278b771c0382d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/286277
Auto-Submit: Adlai Holler <adlai@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
9 files changed