This switches ANGLE to use the upstream XML files for the CL, EGL
GLX and WGL APIs. Since gl.xml has a few more significant diffs
from the upstream version, that work will come in another CL.
This also removes an ANGLE EGL ext that was added upstream.
Bug: angleproject:6461
Change-Id: I29ead5edc13a4256d1f702c330a5d3d233502cd4
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3854318
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Jamie Madill