Web Animations: Update naming to reflect spec changes

Source/core/animation/AnimationPlayer.idl

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-
-// http://www.w3.org/TR/web-animations/#the-animationplayer-interface
-
-// TODO(dstockwell): This interface has been renamed to Animation in the latest
-// spec, which also has several other changes:
-// https://w3c.github.io/web-animations/#the-animation-interface
-
-enum AnimationPlayState { "idle", "pending", "running", "paused", "finished" };
-
-[
-    ActiveDOMObject,
-    NoInterfaceObject,
-] interface AnimationPlayer : EventTarget {
-    [RuntimeEnabled=WebAnimationsAPI] attribute AnimationNode? source;
-    [Measure] attribute double?    startTime;
-    [Measure] attribute double?    currentTime;
-    [Measure] attribute double     playbackRate;
-    [Measure] readonly attribute AnimationPlayState playState;
-    [Measure, RaisesException] void finish();
-    [Measure] void play();
-    [Measure] void pause();
-    [Measure] void reverse();
-
-    [Measure] void cancel();
-    [Measure] attribute EventHandler onfinish;
-    [RuntimeEnabled=WebAnimationsAPI, CallWith=ScriptState] readonly attribute Promise<AnimationPlayer> finished;
-    [RuntimeEnabled=WebAnimationsAPI, CallWith=ScriptState] readonly attribute Promise<AnimationPlayer> ready;
-};