Auto merge of #21593 - chansuke:format_webvr_traits, r=jdm

Format components webvr_traits #21373

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Format `components/webvr_traits` with `rstfmt` command.

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- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix part of #21373.
- [x] These changes do not require tests because _____

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1 files changed, 2 insertions, 1 deletions

diff --git a/components/webvr_traits/lib.rs b/components/webvr_traits/lib.rs
index 9fd8c85074b..baf4b20943e 100644
--- a/components/webvr_traits/lib.rs
+++ b/components/webvr_traits/lib.rs
@@ -6,7 +6,8 @@
 
 extern crate ipc_channel;
 extern crate msg;
-#[macro_use] extern crate serde;
+#[macro_use]
+extern crate serde;
 pub extern crate rust_webvr_api as webvr;
 
 mod webvr_traits;