Remove compositing states from DocumentLifeCycle.

sky/engine/core/dom/DocumentLifecycle.h

 /*
  * 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 37 matching lines @@
         VisualUpdatePending,
 
         InStyleRecalc,
         StyleClean,
 
         InPreLayout,
         InPerformLayout,
         AfterPerformLayout,
         LayoutClean,
 
-        InCompositingUpdate,
-        CompositingClean,
-
         InPaintInvalidation,
         PaintInvalidationClean,
 
         // Once the document starts shuting down, we cannot return
         // to the style/layout/rendering states.
         Stopping,
         Stopped,
         Disposed,
     };
 
@@ skipping 68 matching lines @@
     bool canAdvanceTo(State) const;
     bool canRewindTo(State) const;
 #endif
 
     State m_state;
     int m_detachCount;
 };
 
 inline bool DocumentLifecycle::stateAllowsTreeMutations() const
 {
-    // FIXME: We should not allow mutations in InPreLayout or AfterPerformLayout either,
-    // but we need to fix MediaList listeners and plugins first.
-    return m_state != InStyleRecalc
-        && m_state != InPerformLayout
-        && m_state != InCompositingUpdate;
+    return m_state != InStyleRecalc && m_state != InPerformLayout;
 }
 
 inline bool DocumentLifecycle::stateAllowsRenderTreeMutations() const
 {
     return m_detachCount || m_state == InStyleRecalc;
 }
 
 inline bool DocumentLifecycle::stateAllowsDetach() const
 {
     return m_state == VisualUpdatePending
         || m_state == InStyleRecalc
         || m_state == StyleClean
         || m_state == InPreLayout
         || m_state == LayoutClean
-        || m_state == CompositingClean
         || m_state == PaintInvalidationClean
         || m_state == Stopping;
 }
 
 }
 
 #endif  // SKY_ENGINE_CORE_DOM_DOCUMENTLIFECYCLE_H_