Always show spat nav interest ring

We shouldn't allow the page to override the outline style if the user is
using spat nav since that could lead to invisible interest.

Change-Id: I64c5ab39768033f56b8ffb6efa9e72672ae641da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635194
Auto-Submit: David Bokan <bokan@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665702}

third_party/blink/renderer/core/html/resources/html.css

@@ -1009,7 +1009,7 @@ nobr {
 /* states */
 
 :-internal-spatial-navigation-interest {
-    outline: auto 1px -webkit-focus-ring-color;
+    outline: auto 1px -webkit-focus-ring-color !important;
     box-shadow: none !important
 }