We inconsistantly added some extension txt files to our extensions
folder that are not maintained but possibly implemented by ANGLE. Some
of these extensions trip up Android's automatic license detection.
Bug: None
Change-Id: I9bde4235c7ad2bf4d9bcf5385f4138296cef2c13
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2653848Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
