Revert "Add allow-discrete to non-interpolable WPTs"

This reverts commit d43c0e4219504e68479d2c9e519ba0825cc11b28.

Reason for revert:
Affects results for interop2023 in an unfair way because transition-behavior is not part of interop2023:
#42857 (comment)

Original change's description:
> Add allow-discrete to non-interpolable WPTs
>
> This patch changes the test runner for animation tests in WPT to
> additionally test transition-behavior:allow-discrete for any property
> that we are running a non-interpolable or non-animatable test on.
>
> Change-Id: I7e13600c0182ab5e4839fea4e32e759673abe84e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4989757
> Reviewed-by: David Baron <dbaron@chromium.org>
> Commit-Queue: Joey Arhar <jarhar@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1222343}

Change-Id: I1d067b0c79b1d16b8fdbd1e672f3db9d1befca74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5038074
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: David Baron <dbaron@chromium.org>
Reviewed-by: David Baron <dbaron@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1225735}

css/support/interpolation-testcommon.js

@@ -104,59 +104,6 @@
     },
   };
 
-  var cssTransitionsInterpolationAllowDiscrete = {
-    name: 'CSS Transitions with transition-behavior:allow-discrete',
-    isSupported: function() {return true;},
-    supportsProperty: function() {return true;},
-    supportsValue: function() {return true;},
-    setup: function(property, from, target) {
-      target.style.setProperty(property, isNeutralKeyframe(from) ? '' : from);
-    },
-    nonInterpolationExpectations: function(from, to) {
-      return expectFlip(from, to, 0.5);
-    },
-    notAnimatableExpectations: function(from, to, underlying) {
-      return expectFlip(from, to, -Infinity);
-    },
-    interpolate: function(property, from, to, at, target, behavior) {
-      // Force a style recalc on target to set the 'from' value.
-      getComputedStyle(target).getPropertyValue(property);
-      target.style.transitionDuration = '100s';
-      target.style.transitionDelay = '-50s';
-      target.style.transitionTimingFunction = createEasing(at);
-      target.style.transitionProperty = property;
-      target.style.transitionBehavior = 'allow-discrete';
-      target.style.setProperty(property, isNeutralKeyframe(to) ? '' : to);
-    },
-  };
-
-  var cssTransitionAllInterpolationAllowDiscrete = {
-    name: 'CSS Transitions with transition-property:all and transition-behavor:allow-discrete',
-    isSupported: function() {return true;},
-    // The 'all' value doesn't cover custom properties.
-    supportsProperty: function(property) {return property.indexOf('--') !== 0;},
-    supportsValue: function() {return true;},
-    setup: function(property, from, target) {
-      target.style.setProperty(property, isNeutralKeyframe(from) ? '' : from);
-    },
-    nonInterpolationExpectations: function(from, to) {
-      return expectFlip(from, to, 0.5);
-    },
-    notAnimatableExpectations: function(from, to, underlying) {
-      return expectFlip(from, to, -Infinity);
-    },
-    interpolate: function(property, from, to, at, target, behavior) {
-      // Force a style recalc on target to set the 'from' value.
-      getComputedStyle(target).getPropertyValue(property);
-      target.style.transitionDuration = '100s';
-      target.style.transitionDelay = '-50s';
-      target.style.transitionTimingFunction = createEasing(at);
-      target.style.transitionProperty = 'all';
-      target.style.transitionBehavior = 'allow-discrete';
-      target.style.setProperty(property, isNeutralKeyframe(to) ? '' : to);
-    },
-  };
-
   var webAnimationsInterpolation = {
     name: 'Web Animations',
     isSupported: function() {return 'animate' in Element.prototype;},
@@ -488,19 +435,13 @@
   function test_not_animatable(options) {
     test_interpolation(options, expectNotAnimatable);
   }
-  function create_tests(addAllowDiscreteTests) {
+  function create_tests() {
     var interpolationMethods = [
       cssTransitionsInterpolation,
       cssTransitionAllInterpolation,
       cssAnimationsInterpolation,
       webAnimationsInterpolation,
     ];
-    if (addAllowDiscreteTests) {
-      interpolationMethods = [
-        cssTransitionsInterpolationAllowDiscrete,
-        cssTransitionAllInterpolationAllowDiscrete,
-      ].concat(interpolationMethods);
-    }
     var container = createElement(document.body);
     var targets = createTestTargets(interpolationMethods, interpolationTests, compositionTests, container);
     // Separate interpolation and measurement into different phases to avoid O(n^2) of the number of targets.
@@ -515,7 +456,7 @@
 
   function test_interpolation(options, expectations) {
     interpolationTests.push({options, expectations});
-    create_tests(expectations === expectNoInterpolation || expectations === expectNotAnimatable);
+    create_tests();
     interpolationTests = [];
   }
   function test_composition(options, expectations) {