Fix -Wdeprecated-copy-with-user-provided-copy Example error: definition of implicit copy assignment operator for 'Foo' is deprecated because it has a user-provided copy constructor Bug: chromium:1363759 Change-Id: Ieec435b5c6847ba153bcaebb9a4287ced44fef1f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3900494 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Auto-Submit: Arthur Eubanks <aeubanks@google.com>