Revert "renderergl_utils: Require explicit location qualifier for OpenGLES3" Causes angle_end2end_tests failures on Mac This reverts commit d63243f5be2ac7d8dafa6aea5b23e036074af397. Change-Id: Idf25d7fe9f4162813a4fc67927191747f660fceb Reviewed-on: https://chromium-review.googlesource.com/311041 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>