Clear m_previousActiveInterpolationsForAnimations in maybeApplyPendingUpdate()

Source/core/animation/css/CSSAnimations.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 279 matching lines @@
 
     ASSERT(inactive.isEmpty() || cssAnimations);
     for (const AtomicString& animationName : inactive) {
         ASSERT(!isAnimationStyleChange);
         update.cancelAnimation(animationName, *cssAnimations->m_animations.get(animationName)->animation);
     }
 }
 
 void CSSAnimations::maybeApplyPendingUpdate(Element* element)
 {
-    if (m_pendingUpdate.isEmpty()) {
-        m_previousActiveInterpolationsForAnimations.clear();
+    m_previousActiveInterpolationsForAnimations.clear();
+    if (m_pendingUpdate.isEmpty())
         return;
-    }
 
     m_previousActiveInterpolationsForAnimations.swap(m_pendingUpdate.activeInterpolationsForAnimations());
 
     // FIXME: cancelling, pausing, unpausing animations all query compositingState, which is not necessarily up to date here
     // since we call this from recalc style.
     // https://code.google.com/p/chromium/issues/detail?id=339847
     DisableCompositingQueryAsserts disabler;
 
     for (const AtomicString& animationName : m_pendingUpdate.cancelledAnimationNames()) {
         RefPtrWillBeRawPtr<Animation> animation = m_animations.take(animationName)->animation;
@@ skipping 477 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_transitions);
     visitor->trace(m_pendingUpdate);
     visitor->trace(m_animations);
     visitor->trace(m_previousActiveInterpolationsForAnimations);
 #endif
 }
 
 } // namespace blink