Revert of Import wpt@357b83b809e3cbc7a1805e7c3ca108a7980d782f

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

Index: third_party/WebKit/LayoutTests/imported/wpt/web-animations/testcommon.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/web-animations/testcommon.js b/third_party/WebKit/LayoutTests/imported/wpt/web-animations/testcommon.js
index 31ebdfaf279deca00ef5384fd7d347e1cf00e8e1..e375a0f8741788984f9c7be658a3b88c7396c0ff 100644
--- a/third_party/WebKit/LayoutTests/imported/wpt/web-animations/testcommon.js
+++ b/third_party/WebKit/LayoutTests/imported/wpt/web-animations/testcommon.js
@@ -158,19 +158,3 @@
     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);
-      }
-    }());
-  });
-}