[LayoutNG] remove obsolete ng_macros.h

Bug: 635619
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I2fd589b4db0fbeba4b142d130fb95f9cb804bc49
Reviewed-on: https://chromium-review.googlesource.com/889681
Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Commit-Queue: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532266}
2 files changed