Revert of Import wpt@357b83b809e3cbc7a1805e7c3ca108a7980d782f

third_party/WebKit/LayoutTests/imported/wpt/web-animations/testcommon.js

 /*
 Distributed under both the W3C Test Suite License [1] and the W3C
 3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
 policies and contribution forms [3].
 
 [1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
 [2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
 [3] http://www.w3.org/2004/10/27-testcases
  */
 
@@ skipping 140 matching lines @@
     function handleFrame() {
       if (--frameCount <= 0) {
         resolve();
       } else {
         window.requestAnimationFrame(handleFrame); // wait another frame
       }
     }
     window.requestAnimationFrame(handleFrame);
   });
 }
-
-// Continually calls requestAnimationFrame until |minDelay| has elapsed
-// as recorded using document.timeline.currentTime (i.e. frame time not
-// wall-clock time).
-function waitForAnimationFramesWithDelay(minDelay) {
-  var startTime = document.timeline.currentTime;
-  return new Promise(function(resolve) {
-    (function handleFrame() {
-      if (document.timeline.currentTime - startTime >= minDelay) {
-        resolve();
-      } else {
-        window.requestAnimationFrame(handleFrame);
-      }
-    }());
-  });
-}