Remove unnecessary string copies from "PrintError". am: 7614170cfc

Original change: https://android-review.googlesource.com/c/platform/system/testing/gtest_extras/+/2626395

Change-Id: I4783d85055ca85c72cdba3dcbad0670808aed4a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>