This reverts commit cc93cebf.

Reason for revert: There was a typo in mb_config.py.

https://build.chromium.org/deprecated/tryserver.chromium.angle/builders/win_angle_compile_x64_dbg_ng/builds/0/steps/analyze/logs/stdio

MBErr: Builder name "win_angle_compile_x64_dbg_ng"  not found under masters[tryserver.chromium.angle] in "E:\b\c\b\win\src\tools\mb\mb_config.pyl"

Original change's description:
> Update cq.cfg for new compile-only builders.
> 
> This removes the x64 versions of the Windows tests from the ANGLE CQ.
> They are still available to run as optional try jobs, if we suspect
> a failure. This should reduce the amount of test duplication while
> still keeping complete coverage.
> 
> It also updates the Clang builder to the MSVC builder, since Chrome
> has switched to Clang by default on Windows, and the clang builder
> was a deprecated version of the MSVC builder anyway.
> 
> Bug: chromium:786044
> Change-Id: I786fe85dcdaa57b55b0b44244797c9285c577ea2
> Reviewed-on: https://chromium-review.googlesource.com/782402
> Reviewed-by: Geoff Lang <geofflang@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
> Commit-Queue: Jamie Madill <jmadill@chromium.org>

TBR=geofflang@chromium.org,jmadill@chromium.org,tandrii@chromium.org

Change-Id: If13d3d69f0a1facd3876858afdaf0577f6ab1cb7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:786044
Reviewed-on: https://chromium-review.googlesource.com/784070Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>