SuperSize: Exclude assets/unwind_cfi_* in milestone diffs

This file does not actually exist for stable & beta channels.

Change-Id: I0885a565933b7457c77c5c43eaf218175cbb04ad
Reviewed-on: https://chromium-review.googlesource.com/c/1281282Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599818}

tools/binary_size/libsupersize/static/index.html

@@ -123,7 +123,10 @@ function isGreaterOrEqual(v1, v2) {
   form.addEventListener('submit', event => {
     event.preventDefault();
     const dataUrl = getDataUrl();
-    window.open(`viewer.html?load_url=milestones/${dataUrl}`);
+    // Exclude unwind_cfi via a filter as a work-around for it being included
+    // in the size data. It's a file that exists in dev but not beta/stable.
+    window.open(`viewer.html?load_url=milestones/${dataUrl}` +
+                `&exclude=assets%2Funwind_cfi`);
   });
 })();
   </script>