This patch switches FlowRefs to using the Deref and DerefMut traits, instead of the custom `get` and `get_mut` functions. Source-Repo: https://github.com/servo/servo Source-Revision: 6a11ee89de82abae9d6607a6c2890692df5259eb
Source-Repo: https://github.com/servo/servo Source-Revision: 045328c8e94f5bdfcd67105c5dfa9209f4cd501c
Source-Repo: https://github.com/servo/servo Source-Revision: b1305bb7d051f83850c51bb0da0ccc86a5e07922