Add more missing closing namespace comments.

third_party/WebKit/Source/core/animation/AnimationTimelineTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 343 matching lines @@
 }
 
 TEST_F(AnimationAnimationTimelineTest, UseAnimationAfterTimelineDeref)
 {
     Animation* animation = timeline->play(0);
     timeline.clear();
     // Test passes if this does not crash.
     animation->setStartTime(0);
 }
 
-}
+} // namespace blink