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Renamed `script::dom::BrowsingContext` to `script::dom::WindowProxy`.
The browsing context is mostly maintained in the constellation, not in script. It would be nice to rename `constellation::Frame` to `constellation::BrowsingContext`, but that will be very confusing if there are two `BrowsingContext` types.
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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes do not require tests because renamings aren't externally visible
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Source-Repo: https://github.com/servo/servo
Source-Revision: 34d0e59849a0a3e231e47fe10d66484340b8b80c
bec6bcdcd0