Back out "[litho] Adds check to unset a YogaNode's parent during reconciliation."

Summary: Removes `unsetOwner` from Yoga. This was temporarily for patching a crash.

Reviewed By: colriot

Differential Revision: D15737613

fbshipit-source-id: 8ab93ecf7ffb913df6207fe5db47a8cc93eded2c

java/com/facebook/yoga/YogaNode.java

@@ -42,8 +42,6 @@ public abstract class YogaNode {
   @Nullable
   public abstract YogaNode getOwner();
 
-  public abstract void unsetOwner();
-
   /** @deprecated Use #getOwner() instead. This will be removed in the next version. */
   @Deprecated
   @Nullable

java/com/facebook/yoga/YogaNodeJNIBase.java

@@ -137,11 +137,6 @@ public abstract class YogaNodeJNIBase extends YogaNode implements Cloneable {
     return mOwner;
   }
 
-  @Override
-  public void unsetOwner() {
-    mOwner = null;
-  }
-
   /** @deprecated Use #getOwner() instead. This will be removed in the next version. */
   @Deprecated
   @Nullable