Auto merge of #11265 - Ms2ger:cleanup, r=nox

Some assorted cleanup.

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
- [ ] These changes fix #__ (github issue number if applicable).

Either:
- [ ] There are tests for these changes OR
- [x] 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.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11265)
<!-- Reviewable:end -->

1 files changed, 2 insertions, 4 deletions

diff --git a/components/canvas/canvas_paint_thread.rs b/components/canvas/canvas_paint_thread.rs
index 36fbbe94570..71e721f784d 100644
--- a/components/canvas/canvas_paint_thread.rs
+++ b/components/canvas/canvas_paint_thread.rs
@@ -117,13 +117,11 @@ impl<'a> CanvasPaintThread<'a> {
         }
     }
 
-    /// Creates a new `CanvasPaintThread` and returns the out-of-process sender and the in-process
-    /// sender for it.
+    /// Creates a new `CanvasPaintThread` and returns an `IpcSender` to
+    /// communicate with it.
     pub fn start(size: Size2D<i32>,
                  webrender_api_sender: Option<webrender_traits::RenderApiSender>)
                  -> IpcSender<CanvasMsg> {
-        // TODO(pcwalton): Ask the pipeline to create this for us instead of spawning it directly.
-        // This will be needed for multiprocess Servo.
         let (sender, receiver) = ipc::channel::<CanvasMsg>().unwrap();
         spawn_named("CanvasThread".to_owned(), move || {
             let mut painter = CanvasPaintThread::new(size, webrender_api_sender);