Web Animations: Don't mark players as outdated upon currentTime access

Source/core/animation/Player.h

Index: Source/core/animation/Player.h
diff --git a/Source/core/animation/Player.h b/Source/core/animation/Player.h
index bd55fef253f04d3769890a722b570bda6d878e38..f169208bb5b6960feeeb15662c456550126f2da6 100644
--- a/Source/core/animation/Player.h
+++ b/Source/core/animation/Player.h
@@ -119,7 +119,8 @@ private:
     bool m_held;
     bool m_isPausedForTesting;
 
-    // This indicates timing information relevant to the player has changed
+    // This indicates timing information relevant to the player has changed by
+    // means other than the ordinary progression of time
     bool m_outdated;
 };