A basic implementation of `RootedReference for Option<JS<T>>` based off of
other implementations of `RootedReference` for `Option` wrapped types.
Really I just wanted an excuse to read more in `bindings` 😄 Let me know
if you have any comments or critiques.
Fixes #9654
Source-Repo: https://github.com/servo/servo
Source-Revision: ab381cf951f3e556d0f4c1f2107a311b0d275f91
This ensures that UncheckedUnwrap(obj, /* stopAtOuter = */ true) will indeed
stop at the WindowProxy ("outer window", in older SpiderMonkey jargon), which
is necessary to prevent raw Window ("inner window") objects becoming visible
to JavaScript code, or tripping assertions that we don't do that.
Source-Repo: https://github.com/servo/servo
Source-Revision: 2d1293d54d58e6aa72312edd53aac4e9af5892b6
