Revert "Mark stable dalvik.system.VMStack"

This reverts commit 9ceb6744b3f8130fe27a860ee77e1083726a84b1.

Reason for revert: Breaking master branch because 2 CLs merged at the same time, but both causing change in current.txt file.

Bug: 190613446
Change-Id: Ie84aa0c06abdeb044e1db00371f4baa57c704c5d
3 files changed