Web Animations: Update naming to reflect spec changes

Source/core/animation/AnimationEffectReadOnly.idl

Index: Source/core/animation/AnimationEffectReadOnly.idl
diff --git a/Source/core/animation/AnimationNode.idl b/Source/core/animation/AnimationEffectReadOnly.idl
similarity index 88%
rename from Source/core/animation/AnimationNode.idl
rename to Source/core/animation/AnimationEffectReadOnly.idl
index 119cba2de5577fb4f6cbe0fbfed6ebedd57f91e8..06540d1d07e642d57b7598db9c0a91df194d9e44 100644
--- a/Source/core/animation/AnimationNode.idl
+++ b/Source/core/animation/AnimationEffectReadOnly.idl
@@ -28,16 +28,13 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// http://www.w3.org/TR/web-animations/#the-animationnode-interface
-
-// TODO(dstockwell): This interface has been renamed to AnimationEffectReadonly
-// in the latest spec:
 // https://w3c.github.io/web-animations/#the-animationeffectreadonly-interface
 
 [
     RuntimeEnabled=WebAnimationsAPI,
     WillBeGarbageCollected,
-] interface AnimationNode {
-    readonly attribute Timing timing;
+    ImplementedAs=AnimationEffect,
+] interface AnimationEffectReadOnly {
+    readonly attribute AnimationEffectTiming timing;
     readonly attribute ComputedTimingProperties computedTiming;
 };