Remove angle::Result::Incomplete entirely Bug: angleproject:8414 Change-Id: I8d607614614360b65c530e3e7647d8a7ba38b18e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5031191 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>