Revert of Apply custom property animation

third_party/WebKit/LayoutTests/animations/custom-properties/unregistered-element-animate.html

Index: third_party/WebKit/LayoutTests/animations/custom-properties/unregistered-element-animate.html
diff --git a/third_party/WebKit/LayoutTests/animations/custom-properties/unregistered-element-animate.html b/third_party/WebKit/LayoutTests/animations/custom-properties/unregistered-element-animate.html
deleted file mode 100644
index a75ccf8a74da953d99945cb7b72768c3d097acac..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/animations/custom-properties/unregistered-element-animate.html
+++ /dev/null
@@ -1,19 +0,0 @@
-<script src="../../resources/testharness.js"></script>
-<script src="../../resources/testharnessreport.js"></script>
-<style>
-#target {
-  background-color: var(--x);
-}
-</style>
-<div id="target"></div>
-<script>
-test(() => {
-  var animation = target.animate({'--x': ['green', 'lime']}, 1000);
-  animation.currentTime = 250;
-  assert_equals(getComputedStyle(target).getPropertyValue('--x'), 'green');
-  assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 128, 0)');
-  animation.currentTime = 750;
-  assert_equals(getComputedStyle(target).getPropertyValue('--x'), 'lime');
-  assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 255, 0)');
-}, 'element.animate() animations should apply custom properties');
-</script>