Merge "Use libgtest_prod_headers." am: ba999f5744 am: 0c42697eff am: 5a801e1e36

Original change: https://android-review.googlesource.com/c/platform/packages/modules/StatsD/+/1686444

Change-Id: I7b77ba74823f4d6e38571dd1193f19f14a67c1b3