dbus: Make Bus::Option movable

Copy/move ctor and operator=() must be explicitly declared together.
https://google.github.io/styleguide/cppguide.html#Copyable_Movable_Types

BUG=1257224
TEST=build

Change-Id: Ia8b0f6f667426cfeb69b7fb4ccfa835e2961c07c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3218830
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/main@{#930902}
NOKEYCHECK=True
GitOrigin-RevId: 020d6092695b3e3259e3bbec5e778192e26a2575
2 files changed