Remove KeyframeEffect from AnimationWorklet origin trial test

KeyframeEffect is controlled by RuntimeEnabled=WebAnimationsAPI not the
AnimationWorklet origin trial.

KeyframeEffect was added along with the fix for https://crbug.com/903953,
but the fix does not work because of https://crbug.com/946246.
This issue was hidden by https://crbug.com/946599.

Bug: 903953
Change-Id: I6fc28b4434057fabe974991b4a696f976c58fa43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542456Reviewed-by: Majid Valipour <majidvp@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645324}

third_party/blink/web_tests/http/tests/origin_trials/webexposed/animationworklet-origin-trial-interfaces.html

@@ -2,23 +2,38 @@
 <!-- Generate token with the command:
 generate_token.py http://127.0.0.1:8000 AnimationWorklet --expire-timestamp=2000000000
 -->
-<meta http-equiv="origin-trial" content="AnRfiFGg50a1+vvDBVfbBNiiRFBBQDy+3oMlJw2pUNRb8tPyN2XX0kAJxiA0itCLJTM0DrsIfVYuv4ni0Lu6bQgAAABYeyJvcmlnaW4iOiAiaHR0cDovLzEyNy4wLjAuMTo4MDAwIiwgImZlYXR1cmUiOiAiQW5pbWF0aW9uV29ya2xldCIsICJleHBpcnkiOiAyMDAwMDAwMDAwfQ==" />
 <title>AnimationWorklet - interfaces exposed by origin trial</title>
 <script src="../../resources/testharness.js"></script>
 <script src="../../resources/testharnessreport.js"></script>
 <script src="../../resources/origin-trials-helper.js"></script>
 <script>
+const token="AnRfiFGg50a1+vvDBVfbBNiiRFBBQDy+3oMlJw2pUNRb8tPyN2XX0kAJxiA0itCLJTM0DrsIfVYuv4ni0Lu6bQgAAABYeyJvcmlnaW4iOiAiaHR0cDovLzEyNy4wLjAuMTo4MDAwIiwgImZlYXR1cmUiOiAiQW5pbWF0aW9uV29ya2xldCIsICJleHBpcnkiOiAyMDAwMDAwMDAwfQ=="
+
+interfaces_to_check = ['WorkletAnimation', 'ScrollTimeline'];
+
+properties_to_check = {
+  'WorkletAnimation': ['play', 'cancel', 'playState', 'timeline'],
+  'ScrollTimeline': ['scrollSource', 'orientation', 'timeRange'],
+};
+
+// Check that the interfaces are not present without the token.
+// Experimental web platform features are always enabled when this test is run
+// normally, so do not check them in that case.
+if (!self.internals.runtimeFlags.animationWorkletEnabled) {
+  test(t => {
+    OriginTrialsHelper.check_interfaces_missing(this, interfaces_to_check);
+  }, 'AnimationWorklet related interfaces are not available without a token.');
+}
+
+OriginTrialsHelper.add_token(token);
+
 test(t => {
-  OriginTrialsHelper.check_interfaces(this,
-      ['WorkletAnimation', 'ScrollTimeline', 'KeyframeEffect']);
+  OriginTrialsHelper.check_interfaces(this, interfaces_to_check);
 }, 'AnimationWorklet related interfaces in Origin-Trial enabled document.');
 
 test(t => {
   assert_own_property(CSS, 'animationWorklet');
-  OriginTrialsHelper.check_properties(this,
-      {'WorkletAnimation': ['play', 'cancel', 'playState', 'timeline'],
-       'ScrollTimeline': ['scrollSource', 'orientation', 'timeRange'],
-      });
+  OriginTrialsHelper.check_properties(this, properties_to_check);
 }, 'AnimationWorklet related properties in Origin-Trial enabled document.');
 
 </script>