remove reference of warning-head from octane benchmarking

- it caused null pointer error.

bug: 8584546
Change-Id: Id44729b035759dbb61fb869e8ca2b48642b123c3
diff --git a/suite/pts/deviceTests/browserbench/assets/octane/index.html b/suite/pts/deviceTests/browserbench/assets/octane/index.html
index 704123f..9c072d6 100644
--- a/suite/pts/deviceTests/browserbench/assets/octane/index.html
+++ b/suite/pts/deviceTests/browserbench/assets/octane/index.html
@@ -73,7 +73,6 @@
     document.getElementById("progress-bar-container").style.visibility = 'hidden';
     document.getElementById("bottom-text").style.visibility = 'visible';
     document.getElementById("inside-anchor").removeChild(document.getElementById("bar-appendix"));
-    document.getElementById("warning-header").style.visibility = 'hidden';
   }
 
   function Run() {