Re-add tests using java.nio.file.Files

This reverts commit d94a545fc6c0720e00c38d5c27c0981ca665e3a3.
Which removed b/29721023 related tests
from nyc-mr1 because they use APIs that 
are not present on nyc branches.


Change-Id: Ib0f2040e799d1de6f8a5a20368a4bd8d1dc00156
Test: vogar run on both tests
Bug: 29721023
2 files changed