The macro GTEST_RELATIVE_PATH is obsolete and since it is always
defined this CL just removes it.
Bug: webrtc:9564
Change-Id: Ieafa5b77351c4df87864588ba6b3de8f60d54e89
Reviewed-on: https://webrtc-review.googlesource.com/92080
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24226}