Bug 1504631 [wpt PR 13917] - CSS: serialize pointer-events keywords in lower case, a=testonly

Automatic update from web-platform-testsCSS: serialize pointer-events keywords in lower case

https://drafts.csswg.org/cssom/#serializing-css-values

"To serialize a CSS component value depends on the component, as follows:
keyword
The keyword converted to ASCII lowercase."

Bug: 901666
Change-Id: Iff579a363de13441c75bbebfc951095b071f6060
Reviewed-on: https://chromium-review.googlesource.com/c/1317300
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605383}

--

wpt-commits: f917e2dfc6649f9217f51dec9fd45eaef16188fc
wpt-pr: 13917

testing/web-platform/tests/css/css-typed-om/the-stylepropertymap/properties/pointer-events.html

@@ -15,9 +15,9 @@
 
 runPropertyTests('pointer-events', [
   { syntax: 'bounding-box' },
-  { syntax: 'visiblePainted' },
-  { syntax: 'visibleFill' },
-  { syntax: 'visibleStroke' },
+  { syntax: 'visiblepainted' },
+  { syntax: 'visiblefill' },
+  { syntax: 'visiblestroke' },
   { syntax: 'visible' },
   { syntax: 'painted' },
   { syntax: 'fill' },