[automerger skipped] libprocessgroup: Use WriteStringToFd for WriteFileAction am: 1458350370 -s ours am: cff7952df2 -s ours am: 0cad4c44bc -s ours am: 573aff33a7 -s ours am: b83b16e6d2 -s ours am: 9301a9d41b -s ours

am skip reason: Merged-In Id79f9e1095f52079393c58edb9a4d526f4cc6b5e with SHA-1 d4c53518fe is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/17061322

Change-Id: I768dda5373513ede82923c8d59a9eb8a51a99eb6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>