Prevent accidental misuse of ANGLE_ENABLED ... by removing it altogether. This macro was only available when features.h was included. If that header was not included, the preprocessor would automatically consider it 0, which has the opposite effect from what was desired. Bug: angleproject:8256 Change-Id: Ia141573c0c8b44eef1388f4c3ec73ef770cd2854 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4685226 Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>