Revert "8024: Added test case for highlighting trait items."

This reverts commit d7dcd41.

Author: chetankhilosiya

crates/ide/src/syntax_highlighting/test_data/highlight_trait_items.html

@@ -659,43 +659,6 @@ fn foo() {
     );
 }
 
-#[test]
-fn test_highlight_trait_items() {
-    check_highlighting(
-        r#"
-struct Cat;
-
-trait Animal {
-    const SOUND: &'static str;
-
-    fn make_sound(&self) {
-        println!("{}", Self::SOUND);
-    }
-}
-
-impl Animal for Cat {
-    const SOUND: &'static str = "Meow!";
-}
-
-impl Cat {
-    const SPEED: u32 = 2;
-
-    fn run() {}
-}
-
-fn main() {
-    let cat = Cat;
-    cat.make_sound();
-    let _sound = Cat::SOUND;
-    let _speed = Cat::SPEED;
-    Cat::run();
-}
-"#,
-        expect_file!["./test_data/highlight_trait_items.html"],
-        false,
-    );
-}
-
 /// Highlights the code given by the `ra_fixture` argument, renders the
 /// result as HTML, and compares it with the HTML file given as `snapshot`.
 /// Note that the `snapshot` file is overwritten by the rendered HTML.