servo: Merge #11329 - Report use statements that use {} with only one entry (from c-rhodes:11320); r=jdm

Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data:
- [X ] `./mach build -d` does not report any errors
- [X ] `./mach test-tidy --faster` does not report any errors
- [X ] These changes fix #11320  (github issue number if applicable).

Either:
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____

Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process.

Source-Repo: https://github.com/servo/servo
Source-Revision: 2f9796fa696e9514280777398467696dd4f004b3

servo/components/compositing/lib.rs

@@ -40,7 +40,7 @@ extern crate webrender_traits;
 pub use compositor_thread::{CompositorEventListener, CompositorProxy, CompositorThread};
 use euclid::size::TypedSize2D;
 use gfx::paint_thread::ChromeToPaintMsg;
-use ipc_channel::ipc::{IpcSender};
+use ipc_channel::ipc::IpcSender;
 use layout_traits::LayoutControlChan;
 use msg::constellation_msg::PipelineId;
 use script_traits::ConstellationControlMsg;