[test] Don't add extra 50 ms to wait to actions

Should improve performance on fail.
The waitForFunction already handle the extra timeout.

Bug: none
Change-Id: I9a7039eea2b02642337fa47679d64f14d0fd0ae0
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6264206
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Nikolay Vitkov <nvitkov@chromium.org>

test/shared/helper.ts

@@ -87,10 +87,8 @@ async function performActionOnSelector(
       await drainFrontendTaskQueue();
       return element;
     } catch {
-      // A bit of delay to not retry too often.
-      await new Promise(resolve => setTimeout(resolve, 50));
+      return undefined;
     }
-    return undefined;
   });
 }