Remove Parcel::writeIntPtr.

All uses of this API have been removed. It should
never have been made public in the first place.

bug: 15424960

(cherry picked from commit 7da40c0a84dd89e92201448dd5ed3387dc94df2b)

Change-Id: I8d89f62dbdaee7149ef908e0c97417b85e0c48a2
2 files changed