Fix missing newline at the end of compiler_test.h BUG=angleproject:817 Change-Id: Iaa971c71c0f5bcec46fffb5d2e70f108e6ca6b02 Reviewed-on: https://chromium-review.googlesource.com/276607 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>