Navi: Make cursor into a pointer when hovering over clickable options.

Bug: 934440
Change-Id: I3242df2f77fb92e289942e4967a4cb5c06092e19
Reviewed-on: https://chromium-review.googlesource.com/c/1481855Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634440}

chrome/browser/resources/welcome/onboarding_welcome/shared/chooser_shared_css.html

@@ -20,6 +20,7 @@
         box-shadow: 0 1px 2px 0 rgba(0, 36, 100, .3),
                     0 3px 6px 2px rgba(0, 36, 100, .15);
         box-sizing: border-box;
+        cursor: pointer;
         display: inline-flex;
         flex-direction: column;
         font-family: inherit;