Revert "Make compositingState explicit (re-land #2 with bogus ASSERT removed)"

Source/core/frame/animation/AnimationBase.cpp

Index: Source/core/frame/animation/AnimationBase.cpp
diff --git a/Source/core/frame/animation/AnimationBase.cpp b/Source/core/frame/animation/AnimationBase.cpp
index 5cbd4aaf9685a8ed658dc8367c348c84a86ffa5b..4e3356c7fa1bfefb692b4be96160b5ac61d83293 100644
--- a/Source/core/frame/animation/AnimationBase.cpp
+++ b/Source/core/frame/animation/AnimationBase.cpp
@@ -555,9 +555,8 @@ void AnimationBase::freezeAtTime(double t)
     else
         m_pauseTime = m_startTime + t - m_animation->delay();
 
-    // It is possible that m_isAccelerated is true and m_object->compositingState() is NotComposited, because of style change.
-    // So, both conditions need to be checked.
-    if (m_object && m_object->compositingState() == PaintsIntoOwnBacking && isAccelerated())
+    // It is possible that m_isAccelerated is true and m_object->isComposited() is false, because of style change.
+    if (m_object && m_object->isComposited() && isAccelerated())
         toRenderBoxModelObject(m_object)->suspendAnimations(m_pauseTime);
 }