Outline more code from cthis
Outline more code from cthis

Summary: mhorowitz pointed out that we could outline this branch and then tidy up `getNativePointer` while we were at it.

Reviewed By: mhorowitz, cjhopman

Differential Revision: D19356465

fbshipit-source-id: 04e25756cdfb4621642db1293e090e02c2e3e6f9

facebookincubator/fbjni,facebookincubator/fbjni,facebookincubator/fbjni,facebookincubator/fbjni