Remove YogaNode.create() from the abstract class
Remove YogaNode.create() from the abstract class

Summary:
Remove YogaNode.create() from the abstract class after we made sure nothing uses it anymore
This is the final stage to make `YogaNode` a pure class without JNI references

Reviewed By: SidharthGuglani

Differential Revision: D17280571

fbshipit-source-id: bd0eb138f7a6a9de8988fc0a7b90badbf635dac5

facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/yoga