style: Remove dependency on servo_url (#31358)

In order for stylo to be a separate crate, it needs to depend on less
things from Servo. This change makes it so that stylo no longer depends
on servo_url.

components/gfx/platform/macos/font_template.rs

@@ -160,7 +160,6 @@ impl FontTemplateData {
                 .to_string(),
         )
         .expect("Couldn't parse Core Text font URL!")
-        .as_url()
         .to_file_path()
         .expect("Core Text font didn't name a path!");
         let mut bytes = Vec::new();