Remove unnecessary string copies from "PrintError". am: 7614170cfc am: b5f7d7da55 am: a97bcb90fd am: 5e2046012d am: fd862f6a71

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

Change-Id: Ic4f23f90d4fbcca0653c1c5b3e25c1199ae7bfa8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>